8157989243 has 2 divisors, whose sum is σ = 8157989244. Its totient is φ = 8157989242.

The previous prime is 8157989219. The next prime is 8157989249. The reversal of 8157989243 is 3429897518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8157989243 - 2⁸ = 8157988987 is a prime.

It is not a weakly prime, because it can be changed into another prime (8157989249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4078994621 + 4078994622.

It is an arithmetic number, because the mean of its divisors is an integer number (4078994622).

Almost surely, 2^8157989243 is an apocalyptic number.

8157989243 is a deficient number, since it is larger than the sum of its proper divisors (1).

8157989243 is an equidigital number, since it uses as much as digits as its factorization.

8157989243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 56.

The square root of 8157989243 is about 90321.5879123037. The cubic root of 8157989243 is about 2013.0800400404.

The spelling of 8157989243 in words is "eight billion, one hundred fifty-seven million, nine hundred eighty-nine thousand, two hundred forty-three".