31104635621 has 2 divisors, whose sum is σ = 31104635622. Its totient is φ = 31104635620.

The previous prime is 31104635537. The next prime is 31104635651. The reversal of 31104635621 is 12653640113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30611351521 + 493284100 = 174961^2 + 22210^2 .

It is an emirp because it is prime and its reverse (12653640113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31104635621 - 2²⁶ = 31037526757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31104635651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15552317810 + 15552317811.

It is an arithmetic number, because the mean of its divisors is an integer number (15552317811).

Almost surely, 2^31104635621 is an apocalyptic number.

It is an amenable number.

31104635621 is a deficient number, since it is larger than the sum of its proper divisors (1).

31104635621 is an equidigital number, since it uses as much as digits as its factorization.

31104635621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 31104635621 in words is "thirty-one billion, one hundred four million, six hundred thirty-five thousand, six hundred twenty-one".