91257319 has 2 divisors, whose sum is σ = 91257320. Its totient is φ = 91257318.

The previous prime is 91257293. The next prime is 91257329. The reversal of 91257319 is 91375219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91257319 - 2⁹ = 91256807 is a prime.

It is a super-2 number, since 2×91257319² = 16655796542135522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91257329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45628659 + 45628660.

It is an arithmetic number, because the mean of its divisors is an integer number (45628660).

Almost surely, 2^91257319 is an apocalyptic number.

91257319 is a deficient number, since it is larger than the sum of its proper divisors (1).

91257319 is an equidigital number, since it uses as much as digits as its factorization.

91257319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17010, while the sum is 37.

The square root of 91257319 is about 9552.8696735588. The cubic root of 91257319 is about 450.2177037145.

The spelling of 91257319 in words is "ninety-one million, two hundred fifty-seven thousand, three hundred nineteen".