91510055 has 16 divisors (see below), whose sum is σ = 135153984. Its totient is φ = 57922560.

The previous prime is 91510049. The next prime is 91510093. The reversal of 91510055 is 55001519.

It is not a de Polignac number, because 91510055 - 2⁴ = 91510039 is a prime.

It is a super-4 number, since 4×91510055⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100106 + ... + 101015.

It is an arithmetic number, because the mean of its divisors is an integer number (8447124).

Almost surely, 2^91510055 is an apocalyptic number.

91510055 is a deficient number, since it is larger than the sum of its proper divisors (43643929).

91510055 is a wasteful number, since it uses less digits than its factorization.

91510055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201146.

The product of its (nonzero) digits is 1125, while the sum is 26.

The square root of 91510055 is about 9566.0888036857. The cubic root of 91510055 is about 450.6329447091.

The spelling of 91510055 in words is "ninety-one million, five hundred ten thousand, fifty-five".