91993550 has 24 divisors (see below), whose sum is σ = 186664392. Its totient is φ = 33452000.

The previous prime is 91993543. The next prime is 91993553. The reversal of 91993550 is 5539919.

It is a junction number, because it is equal to n+sod(n) for n = 91993498 and 91993507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91993553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83081 + ... + 84180.

It is an arithmetic number, because the mean of its divisors is an integer number (7777683).

Almost surely, 2^91993550 is an apocalyptic number.

91993550 is an abundant number, since it is smaller than the sum of its proper divisors (94670842).

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

91993550 is a wasteful number, since it uses less digits than its factorization.

91993550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167284 (or 167279 counting only the distinct ones).

The product of its (nonzero) digits is 54675, while the sum is 41.

The square root of 91993550 is about 9591.3268112394. The cubic root of 91993550 is about 451.4251934438.

The spelling of 91993550 in words is "ninety-one million, nine hundred ninety-three thousand, five hundred fifty".