Search a number
-
+
1401581 = 10611321
BaseRepresentation
bin101010110001011101101
32122012121102
411112023231
5324322311
650012445
714625146
oct5261355
92565542
101401581
11878035
12577125
133a0c4c
14286acd
151ca43b
hex1562ed

1401581 has 4 divisors (see below), whose sum is σ = 1403964. Its totient is φ = 1399200.

The previous prime is 1401571. The next prime is 1401601. The reversal of 1401581 is 1851041.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1136356 + 265225 = 1066^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1401581 - 210 = 1400557 is a prime.

It is a super-2 number, since 2×14015812 = 3928858599122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401 + ... + 1721.

It is an arithmetic number, because the mean of its divisors is an integer number (350991).

21401581 is an apocalyptic number.

It is an amenable number.

1401581 is a deficient number, since it is larger than the sum of its proper divisors (2383).

1401581 is a wasteful number, since it uses less digits than its factorization.

1401581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 1401581 is about 1183.8838625473. The cubic root of 1401581 is about 111.9109890145.

The spelling of 1401581 in words is "one million, four hundred one thousand, five hundred eighty-one".

Divisors: 1 1061 1321 1401581