19450507931 has 2 divisors, whose sum is σ = 19450507932. Its totient is φ = 19450507930.

The previous prime is 19450507877. The next prime is 19450507969. The reversal of 19450507931 is 13970505491.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19450507931 is a prime.

It is a super-2 number, since 2×19450507931² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (19450507981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9725253965 + 9725253966.

It is an arithmetic number, because the mean of its divisors is an integer number (9725253966).

Almost surely, 2^19450507931 is an apocalyptic number.

19450507931 is a deficient number, since it is larger than the sum of its proper divisors (1).

19450507931 is an equidigital number, since it uses as much as digits as its factorization.

19450507931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 44.

The spelling of 19450507931 in words is "nineteen billion, four hundred fifty million, five hundred seven thousand, nine hundred thirty-one".