91866499 has 2 divisors, whose sum is σ = 91866500. Its totient is φ = 91866498.

The previous prime is 91866497. The next prime is 91866557. The reversal of 91866499 is 99466819.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91866499 - 2¹ = 91866497 is a prime.

Together with 91866497, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91866491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45933249 + 45933250.

It is an arithmetic number, because the mean of its divisors is an integer number (45933250).

Almost surely, 2^91866499 is an apocalyptic number.

91866499 is a deficient number, since it is larger than the sum of its proper divisors (1).

91866499 is an equidigital number, since it uses as much as digits as its factorization.

91866499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 52.

The square root of 91866499 is about 9584.7012994668. The cubic root of 91866499 is about 451.2172787000.

The spelling of 91866499 in words is "ninety-one million, eight hundred sixty-six thousand, four hundred ninety-nine".