31081492 has 48 divisors (see below), whose sum is σ = 62359360. Its totient is φ = 13436928.

The previous prime is 31081481. The next prime is 31081493. The reversal of 31081492 is 29418013.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31081492.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31081493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160948 + ... + 161140.

Almost surely, 2^31081492 is an apocalyptic number.

It is an amenable number.

31081492 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

31081492 is a wasteful number, since it uses less digits than its factorization.

31081492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 31081492 is about 5575.0777573053. The cubic root of 31081492 is about 314.4130903998.

The spelling of 31081492 in words is "thirty-one million, eighty-one thousand, four hundred ninety-two".