31191616444 has 12 divisors (see below), whose sum is σ = 54658017568. Its totient is φ = 15575040000.

The previous prime is 31191616427. The next prime is 31191616481. The reversal of 31191616444 is 44461619113.

It is a super-2 number, since 2×31191616444² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 31191616397 and 31191616406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5188677 + ... + 5194684.

Almost surely, 2^31191616444 is an apocalyptic number.

It is an amenable number.

31191616444 is a deficient number, since it is larger than the sum of its proper divisors (23466401124).

31191616444 is a wasteful number, since it uses less digits than its factorization.

31191616444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10384116 (or 10384114 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The spelling of 31191616444 in words is "thirty-one billion, one hundred ninety-one million, six hundred sixteen thousand, four hundred forty-four".