91522555 has 4 divisors (see below), whose sum is σ = 109827072. Its totient is φ = 73218040.

The previous prime is 91522553. The next prime is 91522559. The reversal of 91522555 is 55522519.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 91522555 - 2¹ = 91522553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91522555.

It is not an unprimeable number, because it can be changed into a prime (91522553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9152251 + ... + 9152260.

It is an arithmetic number, because the mean of its divisors is an integer number (27456768).

Almost surely, 2^91522555 is an apocalyptic number.

91522555 is a deficient number, since it is larger than the sum of its proper divisors (18304517).

91522555 is a wasteful number, since it uses less digits than its factorization.

91522555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18304516.

The product of its digits is 22500, while the sum is 34.

The square root of 91522555 is about 9566.7421309451. The cubic root of 91522555 is about 450.6534621460.

The spelling of 91522555 in words is "ninety-one million, five hundred twenty-two thousand, five hundred fifty-five".