Search a number
-
+
31020031331 = 191162408541
BaseRepresentation
bin11100111000111100…
…000001110101100011
32222001211122212022022
4130320330001311203
51002012112000311
622130030532055
72145463626062
oct347074016543
988054585268
1031020031331
1112178aa9733
12601866702b
132c047c6a33
141703acc1d9
15c184655db
hex738f01d63

31020031331 has 4 divisors (see below), whose sum is σ = 31182440064. Its totient is φ = 30857622600.

The previous prime is 31020031307. The next prime is 31020031387. The reversal of 31020031331 is 13313002013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13313002013 = 45823290531.

It is a cyclic number.

It is not a de Polignac number, because 31020031331 - 26 = 31020031267 is a prime.

It is a super-2 number, since 2×310200313312 (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31020091331) 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, 81204080 + ... + 81204461.

It is an arithmetic number, because the mean of its divisors is an integer number (7795610016).

Almost surely, 231020031331 is an apocalyptic number.

31020031331 is a deficient number, since it is larger than the sum of its proper divisors (162408733).

31020031331 is a wasteful number, since it uses less digits than its factorization.

31020031331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162408732.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 31020031331 its reverse (13313002013), we get a palindrome (44333033344).

The spelling of 31020031331 in words is "thirty-one billion, twenty million, thirty-one thousand, three hundred thirty-one".

Divisors: 1 191 162408541 31020031331