104191931 has 2 divisors, whose sum is σ = 104191932. Its totient is φ = 104191930.

The previous prime is 104191907. The next prime is 104191949. The reversal of 104191931 is 139191401.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-104191931 is a prime.

It is a super-2 number, since 2×104191931² = 21711916971017522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 104191894 and 104191903.

It is not a weakly prime, because it can be changed into another prime (104191331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52095965 + 52095966.

It is an arithmetic number, because the mean of its divisors is an integer number (52095966).

Almost surely, 2^104191931 is an apocalyptic number.

104191931 is a deficient number, since it is larger than the sum of its proper divisors (1).

104191931 is an equidigital number, since it uses as much as digits as its factorization.

104191931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 104191931 is about 10207.4448810660. Note that the first 3 decimals coincide. The cubic root of 104191931 is about 470.5560508023.

The spelling of 104191931 in words is "one hundred four million, one hundred ninety-one thousand, nine hundred thirty-one".