31596981 has 16 divisors (see below), whose sum is σ = 47759040. Its totient is φ = 18420480.

The previous prime is 31596977. The next prime is 31596991. The reversal of 31596981 is 18969513.

It is not a de Polignac number, because 31596981 - 2² = 31596977 is a prime.

It is a super-2 number, since 2×31596981² = 1996738416628722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31596991) 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, 20580 + ... + 22061.

It is an arithmetic number, because the mean of its divisors is an integer number (2984940).

Almost surely, 2^31596981 is an apocalyptic number.

It is an amenable number.

31596981 is a deficient number, since it is larger than the sum of its proper divisors (16162059).

31596981 is a wasteful number, since it uses less digits than its factorization.

31596981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42676.

The product of its digits is 58320, while the sum is 42.

The square root of 31596981 is about 5621.1191946088. The cubic root of 31596981 is about 316.1417572871.

The spelling of 31596981 in words is "thirty-one million, five hundred ninety-six thousand, nine hundred eighty-one".