91005501 has 16 divisors (see below), whose sum is σ = 124545344. Its totient is φ = 59076864.

The previous prime is 91005493. The next prime is 91005511. The reversal of 91005501 is 10550019.

It is a happy number.

It is not a de Polignac number, because 91005501 - 2³ = 91005493 is a prime.

It is a super-2 number, since 2×91005501² = 16564002424522002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91005511) 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, 50325 + ... + 52101.

It is an arithmetic number, because the mean of its divisors is an integer number (7784084).

Almost surely, 2^91005501 is an apocalyptic number.

It is an amenable number.

91005501 is a deficient number, since it is larger than the sum of its proper divisors (33539843).

91005501 is a wasteful number, since it uses less digits than its factorization.

91005501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 91005501 is about 9539.6803405565. The cubic root of 91005501 is about 449.8032077793.

The spelling of 91005501 in words is "ninety-one million, five thousand, five hundred one".