31601786164 has 24 divisors (see below), whose sum is σ = 59991950088. Its totient is φ = 14478973440.

The previous prime is 31601786143. The next prime is 31601786191. The reversal of 31601786164 is 46168710613.

It can be written as a sum of positive squares in 4 ways, for example, as 6640946064 + 24960840100 = 81492^2 + 157990^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31601786164.

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, 2210857 + ... + 2225104.

It is an arithmetic number, because the mean of its divisors is an integer number (2499664587).

Almost surely, 2^31601786164 is an apocalyptic number.

It is an amenable number.

31601786164 is a deficient number, since it is larger than the sum of its proper divisors (28390163924).

31601786164 is a wasteful number, since it uses less digits than its factorization.

31601786164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4436115 (or 4436113 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 31601786164 in words is "thirty-one billion, six hundred one million, seven hundred eighty-six thousand, one hundred sixty-four".