31375381646 has 16 divisors (see below), whose sum is σ = 53794711680. Its totient is φ = 13444506360.

The previous prime is 31375381517. The next prime is 31375381691. The reversal of 31375381646 is 64618357313.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31375381646.

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, 78536 + ... + 262523.

It is an arithmetic number, because the mean of its divisors is an integer number (3362169480).

Almost surely, 2^31375381646 is an apocalyptic number.

31375381646 is a deficient number, since it is larger than the sum of its proper divisors (22419330034).

31375381646 is a wasteful number, since it uses less digits than its factorization.

31375381646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347639.

The product of its digits is 1088640, while the sum is 47.

The spelling of 31375381646 in words is "thirty-one billion, three hundred seventy-five million, three hundred eighty-one thousand, six hundred forty-six".