91586641 has 4 divisors (see below), whose sum is σ = 92135232. Its totient is φ = 91038052.

The previous prime is 91586629. The next prime is 91586653. The reversal of 91586641 is 14668519.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14668519 = 29 ⋅505811.

It is an interprime number because it is at equal distance from previous prime (91586629) and next prime (91586653).

It is a cyclic number.

It is not a de Polignac number, because 91586641 - 2²⁵ = 58032209 is a prime.

It is a super-2 number, since 2×91586641² = 16776225619325762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91586594 and 91586603.

It is not an unprimeable number, because it can be changed into a prime (91586041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274045 + ... + 274378.

It is an arithmetic number, because the mean of its divisors is an integer number (23033808).

Almost surely, 2^91586641 is an apocalyptic number.

It is an amenable number.

91586641 is a deficient number, since it is larger than the sum of its proper divisors (548591).

91586641 is a wasteful number, since it uses less digits than its factorization.

91586641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548590.

The product of its digits is 51840, while the sum is 40.

The square root of 91586641 is about 9570.0909609052. The cubic root of 91586641 is about 450.7586232526.

The spelling of 91586641 in words is "ninety-one million, five hundred eighty-six thousand, six hundred forty-one".