91095121 has 4 divisors (see below), whose sum is σ = 98102452. Its totient is φ = 84087792.

The previous prime is 91095097. The next prime is 91095131. The reversal of 91095121 is 12159019.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15492096 + 75603025 = 3936^2 + 8695^2 .

It is a cyclic number.

It is not a de Polignac number, because 91095121 - 2⁹ = 91094609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91095121.

It is not an unprimeable number, because it can be changed into a prime (91095131) 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, 3503646 + ... + 3503671.

It is an arithmetic number, because the mean of its divisors is an integer number (24525613).

Almost surely, 2^91095121 is an apocalyptic number.

It is an amenable number.

91095121 is a deficient number, since it is larger than the sum of its proper divisors (7007331).

91095121 is a wasteful number, since it uses less digits than its factorization.

91095121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007330.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 91095121 is about 9544.3764070787. The cubic root of 91095121 is about 449.9508110843.

The spelling of 91095121 in words is "ninety-one million, ninety-five thousand, one hundred twenty-one".