31519431149 has 2 divisors, whose sum is σ = 31519431150. Its totient is φ = 31519431148.

The previous prime is 31519431107. The next prime is 31519431169. The reversal of 31519431149 is 94113491513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31417562500 + 101868649 = 177250^2 + 10093^2 .

It is a cyclic number.

It is not a de Polignac number, because 31519431149 - 2¹² = 31519427053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31519431169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15759715574 + 15759715575.

It is an arithmetic number, because the mean of its divisors is an integer number (15759715575).

Almost surely, 2^31519431149 is an apocalyptic number.

It is an amenable number.

31519431149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31519431149 is an equidigital number, since it uses as much as digits as its factorization.

31519431149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The spelling of 31519431149 in words is "thirty-one billion, five hundred nineteen million, four hundred thirty-one thousand, one hundred forty-nine".