31531145032 has 16 divisors (see below), whose sum is σ = 59160677760. Its totient is φ = 15754964304.

The previous prime is 31531145017. The next prime is 31531145053. The reversal of 31531145032 is 23054113513.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1313388 + ... + 1337179.

It is an arithmetic number, because the mean of its divisors is an integer number (3697542360).

Almost surely, 2^31531145032 is an apocalyptic number.

It is an amenable number.

31531145032 is a deficient number, since it is larger than the sum of its proper divisors (27629532728).

31531145032 is a wasteful number, since it uses less digits than its factorization.

31531145032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652060 (or 2652056 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 31531145032 its reverse (23054113513), we get a palindrome (54585258545).

The spelling of 31531145032 in words is "thirty-one billion, five hundred thirty-one million, one hundred forty-five thousand, thirty-two".