91259887 has 2 divisors, whose sum is σ = 91259888. Its totient is φ = 91259886.

The previous prime is 91259879. The next prime is 91259899. The reversal of 91259887 is 78895219.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91259887 - 2³ = 91259879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91259887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91259827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45629943 + 45629944.

It is an arithmetic number, because the mean of its divisors is an integer number (45629944).

Almost surely, 2^91259887 is an apocalyptic number.

91259887 is a deficient number, since it is larger than the sum of its proper divisors (1).

91259887 is an equidigital number, since it uses as much as digits as its factorization.

91259887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 49.

The square root of 91259887 is about 9553.0040824863. The cubic root of 91259887 is about 450.2219267483.

The spelling of 91259887 in words is "ninety-one million, two hundred fifty-nine thousand, eight hundred eighty-seven".