Search a number
-
+
981430581 = 33143245419
BaseRepresentation
bin111010011111110…
…111000100110101
32112101201211122210
4322133313010311
54002221234311
6241215244033
733215010435
oct7237670465
92471654583
10981430581
11463aa035a
12234819619
13128437c71
14944b62c5
155b2643a6
hex3a7f7135

981430581 has 16 divisors (see below), whose sum is σ = 1382205440. Its totient is φ = 618453360.

The previous prime is 981430517. The next prime is 981430589. The reversal of 981430581 is 185034189.

It is not a de Polignac number, because 981430581 - 26 = 981430517 is a prime.

It is a super-2 number, since 2×9814305812 = 1926411970643995122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981430589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118711 + ... + 126708.

It is an arithmetic number, because the mean of its divisors is an integer number (86387840).

Almost surely, 2981430581 is an apocalyptic number.

It is an amenable number.

981430581 is a deficient number, since it is larger than the sum of its proper divisors (400774859).

981430581 is a wasteful number, since it uses less digits than its factorization.

981430581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245496.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 981430581 is about 31327.7924693075. The cubic root of 981430581 is about 993.7714797462.

The spelling of 981430581 in words is "nine hundred eighty-one million, four hundred thirty thousand, five hundred eighty-one".

Divisors: 1 3 31 43 93 129 1333 3999 245419 736257 7607989 10553017 22823967 31659051 327143527 981430581