91980285 has 32 divisors (see below), whose sum is σ = 156701952. Its totient is φ = 45911040.

The previous prime is 91980277. The next prime is 91980307. The reversal of 91980285 is 58208919.

It is a happy number.

It is not a de Polignac number, because 91980285 - 2³ = 91980277 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49320 + ... + 51150.

It is an arithmetic number, because the mean of its divisors is an integer number (4896936).

Almost surely, 2^91980285 is an apocalyptic number.

It is an amenable number.

91980285 is a deficient number, since it is larger than the sum of its proper divisors (64721667).

91980285 is a wasteful number, since it uses less digits than its factorization.

91980285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 91980285 is about 9590.6352761431. The cubic root of 91980285 is about 451.4034946652.

The spelling of 91980285 in words is "ninety-one million, nine hundred eighty thousand, two hundred eighty-five".