31950981 has 6 divisors (see below), whose sum is σ = 46151430. Its totient is φ = 21300648.

The previous prime is 31950977. The next prime is 31950991. The reversal of 31950981 is 18905913.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17089956 + 14861025 = 4134^2 + 3855^2 .

It is not a de Polignac number, because 31950981 - 2² = 31950977 is a prime.

It is a super-2 number, since 2×31950981² = 2041730373724722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31950991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1775046 + ... + 1775063.

It is an arithmetic number, because the mean of its divisors is an integer number (7691905).

Almost surely, 2^31950981 is an apocalyptic number.

It is an amenable number.

31950981 is a deficient number, since it is larger than the sum of its proper divisors (14200449).

31950981 is a wasteful number, since it uses less digits than its factorization.

31950981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3550115 (or 3550112 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 31950981 is about 5652.5198805489. The cubic root of 31950981 is about 317.3180175220.

The spelling of 31950981 in words is "thirty-one million, nine hundred fifty thousand, nine hundred eighty-one".