31442718389 has 2 divisors, whose sum is σ = 31442718390. Its totient is φ = 31442718388.

The previous prime is 31442718379. The next prime is 31442718397. The reversal of 31442718389 is 98381724413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23082724900 + 8359993489 = 151930^2 + 91433^2 .

It is a cyclic number.

It is not a de Polignac number, because 31442718389 - 2⁸ = 31442718133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31442718379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15721359194 + 15721359195.

It is an arithmetic number, because the mean of its divisors is an integer number (15721359195).

Almost surely, 2^31442718389 is an apocalyptic number.

It is an amenable number.

31442718389 is a deficient number, since it is larger than the sum of its proper divisors (1).

31442718389 is an equidigital number, since it uses as much as digits as its factorization.

31442718389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 50.

The spelling of 31442718389 in words is "thirty-one billion, four hundred forty-two million, seven hundred eighteen thousand, three hundred eighty-nine".