91255995 has 12 divisors (see below), whose sum is σ = 158177136. Its totient is φ = 48669840.

The previous prime is 91255987. The next prime is 91256021. The reversal of 91255995 is 59955219.

91255995 is a `hidden beast` number, since 9 + 1 + 2 + 559 + 95 = 666.

It is not a de Polignac number, because 91255995 - 2³ = 91255987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 2027911 = 91255995 / (9 + 1 + 2 + 5 + 5 + 9 + 9 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 91255995.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1013911 + ... + 1014000.

It is an arithmetic number, because the mean of its divisors is an integer number (13181428).

Almost surely, 2^91255995 is an apocalyptic number.

91255995 is a deficient number, since it is larger than the sum of its proper divisors (66921141).

91255995 is a wasteful number, since it uses less digits than its factorization.

91255995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027922 (or 2027919 counting only the distinct ones).

The product of its digits is 182250, while the sum is 45.

The square root of 91255995 is about 9552.8003747592. The cubic root of 91255995 is about 450.2155263873.

The spelling of 91255995 in words is "ninety-one million, two hundred fifty-five thousand, nine hundred ninety-five".