91255220 has 48 divisors (see below), whose sum is σ = 219571968. Its totient is φ = 31207680.

The previous prime is 91255211. The next prime is 91255243. The reversal of 91255220 is 2255219.

It is a self number, because there is not a number n which added to its sum of digits gives 91255220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87824 + ... + 88856.

It is an arithmetic number, because the mean of its divisors is an integer number (4574416).

Almost surely, 2^91255220 is an apocalyptic number.

It is an amenable number.

91255220 is an abundant number, since it is smaller than the sum of its proper divisors (128316748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91255220 is a wasteful number, since it uses less digits than its factorization.

91255220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 91255220 is about 9552.7598106516. The cubic root of 91255220 is about 450.2142518847.

The spelling of 91255220 in words is "ninety-one million, two hundred fifty-five thousand, two hundred twenty".