19315377931 has 2 divisors, whose sum is σ = 19315377932. Its totient is φ = 19315377930.

The previous prime is 19315377901. The next prime is 19315377997. The reversal of 19315377931 is 13977351391.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19315377931 - 2¹¹ = 19315375883 is a prime.

It is a super-2 number, since 2×19315377931² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19315377901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9657688965 + 9657688966.

It is an arithmetic number, because the mean of its divisors is an integer number (9657688966).

Almost surely, 2^19315377931 is an apocalyptic number.

19315377931 is a deficient number, since it is larger than the sum of its proper divisors (1).

19315377931 is an equidigital number, since it uses as much as digits as its factorization.

19315377931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 535815, while the sum is 49.

The spelling of 19315377931 in words is "nineteen billion, three hundred fifteen million, three hundred seventy-seven thousand, nine hundred thirty-one".