91915959 has 16 divisors (see below), whose sum is σ = 125822304. Its totient is φ = 59664000.

The previous prime is 91915927. The next prime is 91915969. The reversal of 91915959 is 95951919.

It is a happy number.

It is not a de Polignac number, because 91915959 - 2⁵ = 91915927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91915909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15997 + ... + 20969.

It is an arithmetic number, because the mean of its divisors is an integer number (7863894).

Almost surely, 2^91915959 is an apocalyptic number.

91915959 is a deficient number, since it is larger than the sum of its proper divisors (33906345).

91915959 is a wasteful number, since it uses less digits than its factorization.

91915959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5138.

The product of its digits is 164025, while the sum is 48.

The square root of 91915959 is about 9587.2811057150. The cubic root of 91915959 is about 451.2982411216.

The spelling of 91915959 in words is "ninety-one million, nine hundred fifteen thousand, nine hundred fifty-nine".