91330931 has 2 divisors, whose sum is σ = 91330932. Its totient is φ = 91330930.

The previous prime is 91330909. The next prime is 91330951. The reversal of 91330931 is 13903319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91330931 - 2¹⁰ = 91329907 is a prime.

It is a super-2 number, since 2×91330931² = 16682677914653522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91330894 and 91330903.

It is not a weakly prime, because it can be changed into another prime (91330951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45665465 + 45665466.

It is an arithmetic number, because the mean of its divisors is an integer number (45665466).

Almost surely, 2^91330931 is an apocalyptic number.

91330931 is a deficient number, since it is larger than the sum of its proper divisors (1).

91330931 is an equidigital number, since it uses as much as digits as its factorization.

91330931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187, while the sum is 29.

The square root of 91330931 is about 9556.7217705655. The cubic root of 91330931 is about 450.3387260386.

The spelling of 91330931 in words is "ninety-one million, three hundred thirty thousand, nine hundred thirty-one".