91356719 has 2 divisors, whose sum is σ = 91356720. Its totient is φ = 91356718.

The previous prime is 91356709. The next prime is 91356739. The reversal of 91356719 is 91765319.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91356719 - 2⁴ = 91356703 is a prime.

It is a super-2 number, since 2×91356719² = 16692100212889922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91356709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45678359 + 45678360.

It is an arithmetic number, because the mean of its divisors is an integer number (45678360).

Almost surely, 2^91356719 is an apocalyptic number.

91356719 is a deficient number, since it is larger than the sum of its proper divisors (1).

91356719 is an equidigital number, since it uses as much as digits as its factorization.

91356719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 41.

The square root of 91356719 is about 9558.0708827671. The cubic root of 91356719 is about 450.3811075993.

The spelling of 91356719 in words is "ninety-one million, three hundred fifty-six thousand, seven hundred nineteen".