31631252 has 6 divisors (see below), whose sum is σ = 55354698. Its totient is φ = 15815624.

The previous prime is 31631251. The next prime is 31631287. The reversal of 31631252 is 25213613.

It can be written as a sum of positive squares in only one way, i.e., 25260676 + 6370576 = 5026^2 + 2524^2 .

It is a super-2 number, since 2×31631252² = 2001072206175008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31631251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3953903 + ... + 3953910.

It is an arithmetic number, because the mean of its divisors is an integer number (9225783).

Almost surely, 2^31631252 is an apocalyptic number.

It is an amenable number.

31631252 is a deficient number, since it is larger than the sum of its proper divisors (23723446).

31631252 is a wasteful number, since it uses less digits than its factorization.

31631252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7907817 (or 7907815 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 31631252 is about 5624.1667827332. The cubic root of 31631252 is about 316.2560148210.

Adding to 31631252 its reverse (25213613), we get a palindrome (56844865).

It can be divided in two parts, 3 and 1631252, that multiplied together give a triangular number (4893756 = T₃₁₂₈).

The spelling of 31631252 in words is "thirty-one million, six hundred thirty-one thousand, two hundred fifty-two".