31615242493 has 2 divisors, whose sum is σ = 31615242494. Its totient is φ = 31615242492.

The previous prime is 31615242469. The next prime is 31615242521. The reversal of 31615242493 is 39424251613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31418626009 + 196616484 = 177253^2 + 14022^2 .

It is a cyclic number.

It is not a de Polignac number, because 31615242493 - 2¹⁷ = 31615111421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31615242433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15807621246 + 15807621247.

It is an arithmetic number, because the mean of its divisors is an integer number (15807621247).

Almost surely, 2^31615242493 is an apocalyptic number.

It is an amenable number.

31615242493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31615242493 is an equidigital number, since it uses as much as digits as its factorization.

31615242493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 40.

The spelling of 31615242493 in words is "thirty-one billion, six hundred fifteen million, two hundred forty-two thousand, four hundred ninety-three".