91644491 has 2 divisors, whose sum is σ = 91644492. Its totient is φ = 91644490.

The previous prime is 91644461. The next prime is 91644493. The reversal of 91644491 is 19444619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91644491 - 2¹⁴ = 91628107 is a prime.

Together with 91644493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91644493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45822245 + 45822246.

It is an arithmetic number, because the mean of its divisors is an integer number (45822246).

Almost surely, 2^91644491 is an apocalyptic number.

91644491 is a deficient number, since it is larger than the sum of its proper divisors (1).

91644491 is an equidigital number, since it uses as much as digits as its factorization.

91644491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 91644491 is about 9573.1129210931. The cubic root of 91644491 is about 450.8535093541.

The spelling of 91644491 in words is "ninety-one million, six hundred forty-four thousand, four hundred ninety-one".