91361591 has 4 divisors (see below), whose sum is σ = 92859384. Its totient is φ = 89863800.

The previous prime is 91361579. The next prime is 91361609. The reversal of 91361591 is 19516319.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91361591 - 2⁶ = 91361527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91361891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748805 + ... + 748926.

It is an arithmetic number, because the mean of its divisors is an integer number (23214846).

Almost surely, 2^91361591 is an apocalyptic number.

91361591 is a deficient number, since it is larger than the sum of its proper divisors (1497793).

91361591 is a wasteful number, since it uses less digits than its factorization.

91361591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497792.

The product of its digits is 7290, while the sum is 35.

The square root of 91361591 is about 9558.3257425137. The cubic root of 91361591 is about 450.3891136434.

The spelling of 91361591 in words is "ninety-one million, three hundred sixty-one thousand, five hundred ninety-one".