91057554 has 32 divisors (see below), whose sum is σ = 231258240. Its totient is φ = 26016336.

The previous prime is 91057553. The next prime is 91057601. The reversal of 91057554 is 45575019.

It is not an unprimeable number, because it can be changed into a prime (91057553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120069 + ... + 120824.

It is an arithmetic number, because the mean of its divisors is an integer number (7226820).

Almost surely, 2^91057554 is an apocalyptic number.

91057554 is an abundant number, since it is smaller than the sum of its proper divisors (140200686).

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

91057554 is a wasteful number, since it uses less digits than its factorization.

91057554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240911 (or 240905 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 91057554 is about 9542.4081866162. The cubic root of 91057554 is about 449.8889503755. Note that the first 3 decimals are identical.

The spelling of 91057554 in words is "ninety-one million, fifty-seven thousand, five hundred fifty-four".