31957136 has 10 divisors (see below), whose sum is σ = 61916982. Its totient is φ = 15978560.

The previous prime is 31957129. The next prime is 31957139. The reversal of 31957136 is 63175913.

It can be written as a sum of positive squares in only one way, i.e., 31854736 + 102400 = 5644^2 + 320^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31957096 and 31957105.

It is not an unprimeable number, because it can be changed into a prime (31957139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998645 + ... + 998676.

Almost surely, 2^31957136 is an apocalyptic number.

It is an amenable number.

31957136 is a deficient number, since it is larger than the sum of its proper divisors (29959846).

31957136 is a wasteful number, since it uses less digits than its factorization.

31957136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997329 (or 1997323 counting only the distinct ones).

The product of its digits is 17010, while the sum is 35.

The square root of 31957136 is about 5653.0643017747. The cubic root of 31957136 is about 317.3383921390.

The spelling of 31957136 in words is "thirty-one million, nine hundred fifty-seven thousand, one hundred thirty-six".