91375231 has 2 divisors, whose sum is σ = 91375232. Its totient is φ = 91375230.

The previous prime is 91375223. The next prime is 91375241. The reversal of 91375231 is 13257319.

It is a weak prime.

It is an emirp because it is prime and its reverse (13257319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91375231 - 2³ = 91375223 is a prime.

It is a super-2 number, since 2×91375231² = 16698865680606722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91375193 and 91375202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91375241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45687615 + 45687616.

It is an arithmetic number, because the mean of its divisors is an integer number (45687616).

Almost surely, 2^91375231 is an apocalyptic number.

91375231 is a deficient number, since it is larger than the sum of its proper divisors (1).

91375231 is an equidigital number, since it uses as much as digits as its factorization.

91375231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 31.

The square root of 91375231 is about 9559.0392299645. The cubic root of 91375231 is about 450.4115264237.

The spelling of 91375231 in words is "ninety-one million, three hundred seventy-five thousand, two hundred thirty-one".