31685187963 has 64 divisors (see below), whose sum is σ = 50734301184. Its totient is φ = 17336592000.

The previous prime is 31685187931. The next prime is 31685187967. The reversal of 31685187963 is 36978158613.

It is not a de Polignac number, because 31685187963 - 2⁵ = 31685187931 is a prime.

It is a super-2 number, since 2×31685187963² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31685187967) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 3864198 + ... + 3872388.

It is an arithmetic number, because the mean of its divisors is an integer number (792723456).

Almost surely, 2^31685187963 is an apocalyptic number.

31685187963 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31685187963 is a deficient number, since it is larger than the sum of its proper divisors (19049113221).

31685187963 is a wasteful number, since it uses less digits than its factorization.

31685187963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8416.

The product of its digits is 6531840, while the sum is 57.

The spelling of 31685187963 in words is "thirty-one billion, six hundred eighty-five million, one hundred eighty-seven thousand, nine hundred sixty-three".