91325431 has 2 divisors, whose sum is σ = 91325432. Its totient is φ = 91325430.

The previous prime is 91325401. The next prime is 91325447. The reversal of 91325431 is 13452319.

It is a strong prime.

It is an emirp because it is prime and its reverse (13452319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91325431 - 2²³ = 82936823 is a prime.

It is a super-2 number, since 2×91325431² = 16680668694671522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91325431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91325401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45662715 + 45662716.

It is an arithmetic number, because the mean of its divisors is an integer number (45662716).

Almost surely, 2^91325431 is an apocalyptic number.

91325431 is a deficient number, since it is larger than the sum of its proper divisors (1).

91325431 is an equidigital number, since it uses as much as digits as its factorization.

91325431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 91325431 is about 9556.4340106548. The cubic root of 91325431 is about 450.3296859734.

The spelling of 91325431 in words is "ninety-one million, three hundred twenty-five thousand, four hundred thirty-one".