31812311653 has 4 divisors (see below), whose sum is σ = 31867446220. Its totient is φ = 31757177088.

The previous prime is 31812311623. The next prime is 31812311669. The reversal of 31812311653 is 35611321813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35611321813 = 97 ⋅367127029.

It can be written as a sum of positive squares in 2 ways, for example, as 31734572164 + 77739489 = 178142^2 + 8817^2 .

It is a cyclic number.

It is not a de Polignac number, because 31812311653 - 2⁵ = 31812311621 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 (31812311623) 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, 27566418 + ... + 27567571.

It is an arithmetic number, because the mean of its divisors is an integer number (7966861555).

Almost surely, 2^31812311653 is an apocalyptic number.

It is an amenable number.

31812311653 is a deficient number, since it is larger than the sum of its proper divisors (55134567).

31812311653 is an equidigital number, since it uses as much as digits as its factorization.

31812311653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55134566.

The product of its digits is 12960, while the sum is 34.

The spelling of 31812311653 in words is "thirty-one billion, eight hundred twelve million, three hundred eleven thousand, six hundred fifty-three".