91651499 has 2 divisors, whose sum is σ = 91651500. Its totient is φ = 91651498.

The previous prime is 91651489. The next prime is 91651501. The reversal of 91651499 is 99415619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91651499 - 2²⁰ = 90602923 is a prime.

Together with 91651501, 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 (91651429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45825749 + 45825750.

It is an arithmetic number, because the mean of its divisors is an integer number (45825750).

Almost surely, 2^91651499 is an apocalyptic number.

91651499 is a deficient number, since it is larger than the sum of its proper divisors (1).

91651499 is an equidigital number, since it uses as much as digits as its factorization.

91651499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 44.

The square root of 91651499 is about 9573.4789392362. The cubic root of 91651499 is about 450.8650012283.

The spelling of 91651499 in words is "ninety-one million, six hundred fifty-one thousand, four hundred ninety-nine".