91288867 has 2 divisors, whose sum is σ = 91288868. Its totient is φ = 91288866.

The previous prime is 91288859. The next prime is 91288877. The reversal of 91288867 is 76888219.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91288867 - 2³ = 91288859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91288867.

It is not a weakly prime, because it can be changed into another prime (91288877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45644433 + 45644434.

It is an arithmetic number, because the mean of its divisors is an integer number (45644434).

Almost surely, 2^91288867 is an apocalyptic number.

91288867 is a deficient number, since it is larger than the sum of its proper divisors (1).

91288867 is an equidigital number, since it uses as much as digits as its factorization.

91288867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 49.

The square root of 91288867 is about 9554.5207624454. The cubic root of 91288867 is about 450.2695783910.

The spelling of 91288867 in words is "ninety-one million, two hundred eighty-eight thousand, eight hundred sixty-seven".