91337231 has 2 divisors, whose sum is σ = 91337232. Its totient is φ = 91337230.

The previous prime is 91337189. The next prime is 91337287. The reversal of 91337231 is 13273319.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91337231 - 2⁶ = 91337167 is a prime.

It is a super-2 number, since 2×91337231² = 16684979533494722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 91337194 and 91337203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91337291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45668615 + 45668616.

It is an arithmetic number, because the mean of its divisors is an integer number (45668616).

Almost surely, 2^91337231 is an apocalyptic number.

91337231 is a deficient number, since it is larger than the sum of its proper divisors (1).

91337231 is an equidigital number, since it uses as much as digits as its factorization.

91337231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 29.

The square root of 91337231 is about 9557.0513758167. The cubic root of 91337231 is about 450.3490805764.

The spelling of 91337231 in words is "ninety-one million, three hundred thirty-seven thousand, two hundred thirty-one".