31961615973 has 24 divisors (see below), whose sum is σ = 49583685312. Its totient is φ = 18259887744.

The previous prime is 31961615941. The next prime is 31961615999. The reversal of 31961615973 is 37951616913.

It is a happy number.

It is not a de Polignac number, because 31961615973 - 2⁵ = 31961615941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31961615773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 758136 + ... + 799182.

It is an arithmetic number, because the mean of its divisors is an integer number (2065986888).

Almost surely, 2^31961615973 is an apocalyptic number.

It is an amenable number.

31961615973 is a deficient number, since it is larger than the sum of its proper divisors (17622069339).

31961615973 is a wasteful number, since it uses less digits than its factorization.

31961615973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46361 (or 46354 counting only the distinct ones).

The product of its digits is 918540, while the sum is 51.

The spelling of 31961615973 in words is "thirty-one billion, nine hundred sixty-one million, six hundred fifteen thousand, nine hundred seventy-three".