19408738931 has 2 divisors, whose sum is σ = 19408738932. Its totient is φ = 19408738930.

The previous prime is 19408738927. The next prime is 19408738933. The reversal of 19408738931 is 13983780491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19408738931 - 2² = 19408738927 is a prime.

It is a super-2 number, since 2×19408738931² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 19408738933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19408738933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9704369465 + 9704369466.

It is an arithmetic number, because the mean of its divisors is an integer number (9704369466).

Almost surely, 2^19408738931 is an apocalyptic number.

19408738931 is a deficient number, since it is larger than the sum of its proper divisors (1).

19408738931 is an equidigital number, since it uses as much as digits as its factorization.

19408738931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 19408738931 in words is "nineteen billion, four hundred eight million, seven hundred thirty-eight thousand, nine hundred thirty-one".