91383631 has 2 divisors, whose sum is σ = 91383632. Its totient is φ = 91383630.

The previous prime is 91383613. The next prime is 91383647. The reversal of 91383631 is 13638319.

Together with previous prime (91383613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91383631 - 2⁷ = 91383503 is a prime.

It is a super-2 number, since 2×91383631² = 16701936029488322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91383431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45691815 + 45691816.

It is an arithmetic number, because the mean of its divisors is an integer number (45691816).

Almost surely, 2^91383631 is an apocalyptic number.

91383631 is a deficient number, since it is larger than the sum of its proper divisors (1).

91383631 is an equidigital number, since it uses as much as digits as its factorization.

91383631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 91383631 is about 9559.4785945678. The cubic root of 91383631 is about 450.4253279060.

It can be divided in two parts, 9138 and 3631, that added together give a square (12769 = 113²).

The spelling of 91383631 in words is "ninety-one million, three hundred eighty-three thousand, six hundred thirty-one".