31895816836 has 27 divisors (see below), whose sum is σ = 60450429711. Its totient is φ = 14719003104.

The previous prime is 31895816831. The next prime is 31895816861. The reversal of 31895816836 is 63861859813.

The square root of 31895816836 is 178594.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 24177140100 + 7718676736 = 155490^2 + 87856^2 .

It is a super-2 number, since 2×31895816836² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31895816831) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4640010 + ... + 4646878.

Almost surely, 2^31895816836 is an apocalyptic number.

31895816836 is the 178594-th square number.

It is an amenable number.

31895816836 is a deficient number, since it is larger than the sum of its proper divisors (28554612875).

31895816836 is an frugal number, since it uses more digits than its factorization.

31895816836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13768 (or 6884 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 58.

The spelling of 31895816836 in words is "thirty-one billion, eight hundred ninety-five million, eight hundred sixteen thousand, eight hundred thirty-six".