91764287 has 2 divisors, whose sum is σ = 91764288. Its totient is φ = 91764286.

The previous prime is 91764271. The next prime is 91764301. The reversal of 91764287 is 78246719.

It is a strong prime.

It is an emirp because it is prime and its reverse (78246719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91764287 - 2⁴ = 91764271 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91764187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45882143 + 45882144.

It is an arithmetic number, because the mean of its divisors is an integer number (45882144).

Almost surely, 2^91764287 is an apocalyptic number.

91764287 is a deficient number, since it is larger than the sum of its proper divisors (1).

91764287 is an equidigital number, since it uses as much as digits as its factorization.

91764287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 44.

The square root of 91764287 is about 9579.3677766333. The cubic root of 91764287 is about 451.0498729678.

The spelling of 91764287 in words is "ninety-one million, seven hundred sixty-four thousand, two hundred eighty-seven".