31442718397 has 2 divisors, whose sum is σ = 31442718398. Its totient is φ = 31442718396.

The previous prime is 31442718389. The next prime is 31442718403. The reversal of 31442718397 is 79381724413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29635278201 + 1807440196 = 172149^2 + 42514^2 .

It is a cyclic number.

It is not a de Polignac number, because 31442718397 - 2³ = 31442718389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31442718397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31442778397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15721359198 + 15721359199.

It is an arithmetic number, because the mean of its divisors is an integer number (15721359199).

Almost surely, 2^31442718397 is an apocalyptic number.

It is an amenable number.

31442718397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31442718397 is an equidigital number, since it uses as much as digits as its factorization.

31442718397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The spelling of 31442718397 in words is "thirty-one billion, four hundred forty-two million, seven hundred eighteen thousand, three hundred ninety-seven".