91105051 has 4 divisors (see below), whose sum is σ = 91441504. Its totient is φ = 90768600.

The previous prime is 91105009. The next prime is 91105061. The reversal of 91105051 is 15050119.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91105051 - 2⁹ = 91104539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91105061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167820 + ... + 168361.

It is an arithmetic number, because the mean of its divisors is an integer number (22860376).

Almost surely, 2^91105051 is an apocalyptic number.

91105051 is a deficient number, since it is larger than the sum of its proper divisors (336453).

91105051 is a wasteful number, since it uses less digits than its factorization.

91105051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336452.

The product of its (nonzero) digits is 225, while the sum is 22.

The square root of 91105051 is about 9544.8965945158. The cubic root of 91105051 is about 449.9671597433.

It can be divided in two parts, 9110 and 5051, that added together give a square (14161 = 119²).

The spelling of 91105051 in words is "ninety-one million, one hundred five thousand, fifty-one".