31230506621 has 4 divisors (see below), whose sum is σ = 31231375644. Its totient is φ = 31229637600.

The previous prime is 31230506603. The next prime is 31230506623. The reversal of 31230506621 is 12660503213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12660503213 = 61 ⋅207549233.

It can be written as a sum of positive squares in 2 ways, for example, as 4046740996 + 27183765625 = 63614^2 + 164875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31230506621 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 (31230506623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378170 + ... + 453291.

It is an arithmetic number, because the mean of its divisors is an integer number (7807843911).

Almost surely, 2^31230506621 is an apocalyptic number.

It is an amenable number.

31230506621 is a deficient number, since it is larger than the sum of its proper divisors (869023).

31230506621 is an equidigital number, since it uses as much as digits as its factorization.

31230506621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869022.

The product of its (nonzero) digits is 6480, while the sum is 29.

The spelling of 31230506621 in words is "thirty-one billion, two hundred thirty million, five hundred six thousand, six hundred twenty-one".