8521045091 has 4 divisors (see below), whose sum is σ = 9176510112. Its totient is φ = 7865580072.

The previous prime is 8521045081. The next prime is 8521045109. The reversal of 8521045091 is 1905401258.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1905401258 = 2 ⋅952700629.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8521045091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8521045021) 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, 327732491 + ... + 327732516.

It is an arithmetic number, because the mean of its divisors is an integer number (2294127528).

Almost surely, 2^8521045091 is an apocalyptic number.

8521045091 is a deficient number, since it is larger than the sum of its proper divisors (655465021).

8521045091 is a wasteful number, since it uses less digits than its factorization.

8521045091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655465020.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 8521045091 is about 92309.5070455909. The cubic root of 8521045091 is about 2042.5104530826.

The spelling of 8521045091 in words is "eight billion, five hundred twenty-one million, forty-five thousand, ninety-one".