91626643 has 4 divisors (see below), whose sum is σ = 91731528. Its totient is φ = 91521760.

The previous prime is 91626629. The next prime is 91626653. The reversal of 91626643 is 34662619.

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: 34662619 = 31 ⋅1118149.

It is a cyclic number.

It is not a de Polignac number, because 91626643 - 2⁵ = 91626611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91626653) 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, 51121 + ... + 52882.

It is an arithmetic number, because the mean of its divisors is an integer number (22932882).

Almost surely, 2^91626643 is an apocalyptic number.

91626643 is a deficient number, since it is larger than the sum of its proper divisors (104885).

91626643 is a wasteful number, since it uses less digits than its factorization.

91626643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104884.

The product of its digits is 46656, while the sum is 37.

The square root of 91626643 is about 9572.1806815375. The cubic root of 91626643 is about 450.8242391609.

The spelling of 91626643 in words is "ninety-one million, six hundred twenty-six thousand, six hundred forty-three".