8637491243 has 4 divisors (see below), whose sum is σ = 8668229928. Its totient is φ = 8606752560.

The previous prime is 8637491221. The next prime is 8637491287. The reversal of 8637491243 is 3421947368.

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 8637491243 - 2⁶ = 8637491179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8637491293) 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, 15368921 + ... + 15369482.

It is an arithmetic number, because the mean of its divisors is an integer number (2167057482).

Almost surely, 2^8637491243 is an apocalyptic number.

8637491243 is a deficient number, since it is larger than the sum of its proper divisors (30738685).

8637491243 is a wasteful number, since it uses less digits than its factorization.

8637491243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30738684.

The product of its digits is 870912, while the sum is 47.

The square root of 8637491243 is about 92938.1043652172. The cubic root of 8637491243 is about 2051.7725096506.

The spelling of 8637491243 in words is "eight billion, six hundred thirty-seven million, four hundred ninety-one thousand, two hundred forty-three".