8640238291 has 2 divisors, whose sum is σ = 8640238292. Its totient is φ = 8640238290.

The previous prime is 8640238267. The next prime is 8640238301. The reversal of 8640238291 is 1928320468.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8640238291 - 2¹⁵ = 8640205523 is a prime.

It is not a weakly prime, because it can be changed into another prime (8640238591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320119145 + 4320119146.

It is an arithmetic number, because the mean of its divisors is an integer number (4320119146).

Almost surely, 2^8640238291 is an apocalyptic number.

8640238291 is a deficient number, since it is larger than the sum of its proper divisors (1).

8640238291 is an equidigital number, since it uses as much as digits as its factorization.

8640238291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 8640238291 is about 92952.8821016325. The cubic root of 8640238291 is about 2051.9900002774.

The spelling of 8640238291 in words is "eight billion, six hundred forty million, two hundred thirty-eight thousand, two hundred ninety-one".