31426665997 has 2 divisors, whose sum is σ = 31426665998. Its totient is φ = 31426665996.

The previous prime is 31426665983. The next prime is 31426666027. The reversal of 31426665997 is 79956662413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21988737796 + 9437928201 = 148286^2 + 97149^2 .

It is a cyclic number.

It is not a de Polignac number, because 31426665997 - 2⁷ = 31426665869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31426665937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15713332998 + 15713332999.

It is an arithmetic number, because the mean of its divisors is an integer number (15713332999).

Almost surely, 2^31426665997 is an apocalyptic number.

It is an amenable number.

31426665997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31426665997 is an equidigital number, since it uses as much as digits as its factorization.

31426665997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14696640, while the sum is 58.

The spelling of 31426665997 in words is "thirty-one billion, four hundred twenty-six million, six hundred sixty-five thousand, nine hundred ninety-seven".