31626742321 has 2 divisors, whose sum is σ = 31626742322. Its totient is φ = 31626742320.

The previous prime is 31626742313. The next prime is 31626742331. The reversal of 31626742321 is 12324762613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31626709921 + 32400 = 177839^2 + 180^2 .

It is an emirp because it is prime and its reverse (12324762613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31626742321 - 2³ = 31626742313 is a prime.

It is not a weakly prime, because it can be changed into another prime (31626742331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15813371160 + 15813371161.

It is an arithmetic number, because the mean of its divisors is an integer number (15813371161).

Almost surely, 2^31626742321 is an apocalyptic number.

It is an amenable number.

31626742321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31626742321 is an equidigital number, since it uses as much as digits as its factorization.

31626742321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 37.

The spelling of 31626742321 in words is "thirty-one billion, six hundred twenty-six million, seven hundred forty-two thousand, three hundred twenty-one".