31612018973 has 4 divisors (see below), whose sum is σ = 32383043868. Its totient is φ = 30840994080.

The previous prime is 31612018939. The next prime is 31612019039. The reversal of 31612018973 is 37981021613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37981021613 = 5591 ⋅6793243.

It can be written as a sum of positive squares in 2 ways, for example, as 9022530169 + 22589488804 = 94987^2 + 150298^2 .

It is a cyclic number.

It is not a de Polignac number, because 31612018973 - 2⁸ = 31612018717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 771024853 = 31612018973 / (3 + 1 + 6 + 1 + 2 + 0 + 1 + 8 + 9 + 7 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31612018973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31612018573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385512386 + ... + 385512467.

It is an arithmetic number, because the mean of its divisors is an integer number (8095760967).

Almost surely, 2^31612018973 is an apocalyptic number.

It is an amenable number.

31612018973 is a deficient number, since it is larger than the sum of its proper divisors (771024895).

31612018973 is an equidigital number, since it uses as much as digits as its factorization.

31612018973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771024894.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 31612018973 in words is "thirty-one billion, six hundred twelve million, eighteen thousand, nine hundred seventy-three".