31145532 has 24 divisors (see below), whose sum is σ = 79279872. Its totient is φ = 9438000.

The previous prime is 31145509. The next prime is 31145557. The reversal of 31145532 is 23554113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117844 + ... + 118107.

It is an arithmetic number, because the mean of its divisors is an integer number (3303328).

Almost surely, 2^31145532 is an apocalyptic number.

It is an amenable number.

31145532 is an abundant number, since it is smaller than the sum of its proper divisors (48134340).

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

31145532 is a wasteful number, since it uses less digits than its factorization.

31145532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235969 (or 235967 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 31145532 is about 5580.8182195804. The cubic root of 31145532 is about 314.6288801421.

Adding to 31145532 its reverse (23554113), we get a palindrome (54699645).

It can be divided in two parts, 3114 and 5532, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 31145532 in words is "thirty-one million, one hundred forty-five thousand, five hundred thirty-two".