8124722491 has 4 divisors (see below), whose sum is σ = 8141005000. Its totient is φ = 8108439984.

The previous prime is 8124722479. The next prime is 8124722527. The reversal of 8124722491 is 1942274218.

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 8124722491 - 2²¹ = 8122625339 is a prime.

It is a super-2 number, since 2×8124722491² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8124722471) 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, 8140506 + ... + 8141503.

It is an arithmetic number, because the mean of its divisors is an integer number (2035251250).

Almost surely, 2^8124722491 is an apocalyptic number.

8124722491 is a deficient number, since it is larger than the sum of its proper divisors (16282509).

8124722491 is a wasteful number, since it uses less digits than its factorization.

8124722491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16282508.

The product of its digits is 64512, while the sum is 40.

The square root of 8124722491 is about 90137.2425304879. The cubic root of 8124722491 is about 2010.3399910835.

The spelling of 8124722491 in words is "eight billion, one hundred twenty-four million, seven hundred twenty-two thousand, four hundred ninety-one".