91361491 has 4 divisors (see below), whose sum is σ = 98389312. Its totient is φ = 84333672.

The previous prime is 91361483. The next prime is 91361527. The reversal of 91361491 is 19416319.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19416319 = 13 ⋅1493563.

It is a cyclic number.

It is not a de Polignac number, because 91361491 - 2³ = 91361483 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3513891 + ... + 3513916.

It is an arithmetic number, because the mean of its divisors is an integer number (24597328).

Almost surely, 2^91361491 is an apocalyptic number.

91361491 is a deficient number, since it is larger than the sum of its proper divisors (7027821).

91361491 is a wasteful number, since it uses less digits than its factorization.

91361491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7027820.

The product of its digits is 5832, while the sum is 34.

The square root of 91361491 is about 9558.3205114706. The cubic root of 91361491 is about 450.3889493186.

The spelling of 91361491 in words is "ninety-one million, three hundred sixty-one thousand, four hundred ninety-one".