91090755 has 72 divisors (see below), whose sum is σ = 185842800. Its totient is φ = 41150592.

The previous prime is 91090739. The next prime is 91090793. The reversal of 91090755 is 55709019.

It is a happy number.

It is not a de Polignac number, because 91090755 - 2⁴ = 91090739 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 71 ways as a sum of consecutive naturals, for example, 240156 + ... + 240534.

It is an arithmetic number, because the mean of its divisors is an integer number (2581150).

Almost surely, 2^91090755 is an apocalyptic number.

91090755 is an abundant number, since it is smaller than the sum of its proper divisors (94752045).

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

91090755 is a wasteful number, since it uses less digits than its factorization.

91090755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 14175, while the sum is 36.

The square root of 91090755 is about 9544.1476832664. The cubic root of 91090755 is about 449.9436225668.

The spelling of 91090755 in words is "ninety-one million, ninety thousand, seven hundred fifty-five".