31634831621 has 2 divisors, whose sum is σ = 31634831622. Its totient is φ = 31634831620.

The previous prime is 31634831611. The next prime is 31634831749. The reversal of 31634831621 is 12613843613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21989627521 + 9645204100 = 148289^2 + 98210^2 .

It is a cyclic number.

It is not a de Polignac number, because 31634831621 - 2¹⁰ = 31634830597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31634831611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15817415810 + 15817415811.

It is an arithmetic number, because the mean of its divisors is an integer number (15817415811).

Almost surely, 2^31634831621 is an apocalyptic number.

It is an amenable number.

31634831621 is a deficient number, since it is larger than the sum of its proper divisors (1).

31634831621 is an equidigital number, since it uses as much as digits as its factorization.

31634831621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 38.

The spelling of 31634831621 in words is "thirty-one billion, six hundred thirty-four million, eight hundred thirty-one thousand, six hundred twenty-one".