31626742393 has 2 divisors, whose sum is σ = 31626742394. Its totient is φ = 31626742392.

The previous prime is 31626742361. The next prime is 31626742409. The reversal of 31626742393 is 39324762613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30384673344 + 1242069049 = 174312^2 + 35243^2 .

It is a cyclic number.

It is not a de Polignac number, because 31626742393 - 2⁵ = 31626742361 is a prime.

It is not a weakly prime, because it can be changed into another prime (31626742313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15813371196 + 15813371197.

It is an arithmetic number, because the mean of its divisors is an integer number (15813371197).

Almost surely, 2^31626742393 is an apocalyptic number.

It is an amenable number.

31626742393 is a deficient number, since it is larger than the sum of its proper divisors (1).

31626742393 is an equidigital number, since it uses as much as digits as its factorization.

31626742393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 46.

The spelling of 31626742393 in words is "thirty-one billion, six hundred twenty-six million, seven hundred forty-two thousand, three hundred ninety-three".