31681232 has 20 divisors (see below), whose sum is σ = 66962976. Its totient is φ = 14400480.

The previous prime is 31681231. The next prime is 31681261. The reversal of 31681232 is 23218613.

It is a super-2 number, since 2×31681232² = 2007400922075648, which contains 22 as substring.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31681231) 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 in 3 ways as a sum of consecutive naturals, for example, 89828 + ... + 90179.

Almost surely, 2^31681232 is an apocalyptic number.

It is an amenable number.

31681232 is an abundant number, since it is smaller than the sum of its proper divisors (35281744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31681232 is a wasteful number, since it uses less digits than its factorization.

31681232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180026 (or 180020 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 31681232 is about 5628.6083537585. The cubic root of 31681232 is about 316.4224974054.

Adding to 31681232 its reverse (23218613), we get a palindrome (54899845).

It can be divided in two parts, 31681 and 232, that added together give a palindrome (31913).

The spelling of 31681232 in words is "thirty-one million, six hundred eighty-one thousand, two hundred thirty-two".