91075205 has 16 divisors (see below), whose sum is σ = 124622064. Its totient is φ = 63298560.

The previous prime is 91075199. The next prime is 91075219. The reversal of 91075205 is 50257019.

It can be written as a sum of positive squares in 8 ways, for example, as 3147076 + 87928129 = 1774^2 + 9377^2 .

It is not a de Polignac number, because 91075205 - 2²⁴ = 74297989 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 40106 + ... + 42315.

It is an arithmetic number, because the mean of its divisors is an integer number (7788879).

Almost surely, 2^91075205 is an apocalyptic number.

It is an amenable number.

91075205 is a deficient number, since it is larger than the sum of its proper divisors (33546859).

91075205 is a wasteful number, since it uses less digits than its factorization.

91075205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82456.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 91075205 is about 9543.3330131564. Note that the first 3 decimals coincide. The cubic root of 91075205 is about 449.9180179871.

The spelling of 91075205 in words is "ninety-one million, seventy-five thousand, two hundred five".