31197109519 has 2 divisors, whose sum is σ = 31197109520. Its totient is φ = 31197109518.

The previous prime is 31197109511. The next prime is 31197109553. The reversal of 31197109519 is 91590179113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31197109519 - 2³ = 31197109511 is a prime.

It is a super-2 number, since 2×31197109519² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31197109511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15598554759 + 15598554760.

It is an arithmetic number, because the mean of its divisors is an integer number (15598554760).

Almost surely, 2^31197109519 is an apocalyptic number.

31197109519 is a deficient number, since it is larger than the sum of its proper divisors (1).

31197109519 is an equidigital number, since it uses as much as digits as its factorization.

31197109519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 76545, while the sum is 46.

The spelling of 31197109519 in words is "thirty-one billion, one hundred ninety-seven million, one hundred nine thousand, five hundred nineteen".