91456531 has 4 divisors (see below), whose sum is σ = 91476000. Its totient is φ = 91437064.

The previous prime is 91456523. The next prime is 91456543. The reversal of 91456531 is 13565419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13565419 = 7 ⋅1937917.

It is a cyclic number.

It is not a de Polignac number, because 91456531 - 2³ = 91456523 is a prime.

It is a super-2 number, since 2×91456531² = 16728594125107922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91486531) 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, 2145 + ... + 13693.

It is an arithmetic number, because the mean of its divisors is an integer number (22869000).

Almost surely, 2^91456531 is an apocalyptic number.

91456531 is a deficient number, since it is larger than the sum of its proper divisors (19469).

91456531 is a wasteful number, since it uses less digits than its factorization.

91456531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19468.

The product of its digits is 16200, while the sum is 34.

The square root of 91456531 is about 9563.2908039022. The cubic root of 91456531 is about 450.5450695506.

The spelling of 91456531 in words is "ninety-one million, four hundred fifty-six thousand, five hundred thirty-one".