31301131997 has 2 divisors, whose sum is σ = 31301131998. Its totient is φ = 31301131996.

The previous prime is 31301131951. The next prime is 31301132021. The reversal of 31301131997 is 79913110313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22956492196 + 8344639801 = 151514^2 + 91349^2 .

It is a cyclic number.

It is not a de Polignac number, because 31301131997 - 2³² = 27006164701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31301131997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31301131907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15650565998 + 15650565999.

It is an arithmetic number, because the mean of its divisors is an integer number (15650565999).

Almost surely, 2^31301131997 is an apocalyptic number.

It is an amenable number.

31301131997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31301131997 is an equidigital number, since it uses as much as digits as its factorization.

31301131997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15309, while the sum is 38.

The spelling of 31301131997 in words is "thirty-one billion, three hundred one million, one hundred thirty-one thousand, nine hundred ninety-seven".