31099716973 has 18 divisors (see below), whose sum is σ = 34110431754. Its totient is φ = 28186822368.

The previous prime is 31099716953. The next prime is 31099716979. The reversal of 31099716973 is 37961799013.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2266997769 + 28832719204 = 47613^2 + 169802^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31099716973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31099716979) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 37514323 + ... + 37515151.

Almost surely, 2^31099716973 is an apocalyptic number.

It is an amenable number.

31099716973 is a deficient number, since it is larger than the sum of its proper divisors (3010714781).

31099716973 is an frugal number, since it uses more digits than its factorization.

31099716973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 1928934, while the sum is 55.

The spelling of 31099716973 in words is "thirty-one billion, ninety-nine million, seven hundred sixteen thousand, nine hundred seventy-three".