31990586512 has 20 divisors (see below), whose sum is σ = 61986172140. Its totient is φ = 15994155008.

The previous prime is 31990586503. The next prime is 31990586513. The reversal of 31990586512 is 21568509913.

It can be written as a sum of positive squares in 2 ways, for example, as 2336368896 + 29654217616 = 48336^2 + 172204^2 .

It is a super-2 number, since 2×31990586512² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31990586513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189708 + ... + 316180.

It is an arithmetic number, because the mean of its divisors is an integer number (3099308607).

Almost surely, 2^31990586512 is an apocalyptic number.

It is an amenable number.

31990586512 is a deficient number, since it is larger than the sum of its proper divisors (29995585628).

31990586512 is a wasteful number, since it uses less digits than its factorization.

31990586512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142290 (or 142284 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 49.

The spelling of 31990586512 in words is "thirty-one billion, nine hundred ninety million, five hundred eighty-six thousand, five hundred twelve".