91245587 has 2 divisors, whose sum is σ = 91245588. Its totient is φ = 91245586.

The previous prime is 91245533. The next prime is 91245593. The reversal of 91245587 is 78554219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91245587 - 2¹⁶ = 91180051 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91245487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45622793 + 45622794.

It is an arithmetic number, because the mean of its divisors is an integer number (45622794).

Almost surely, 2^91245587 is an apocalyptic number.

91245587 is a deficient number, since it is larger than the sum of its proper divisors (1).

91245587 is an equidigital number, since it uses as much as digits as its factorization.

91245587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 41.

The square root of 91245587 is about 9552.2555975016. The cubic root of 91245587 is about 450.1984096256.

The spelling of 91245587 in words is "ninety-one million, two hundred forty-five thousand, five hundred eighty-seven".