8640251 has 2 divisors, whose sum is σ = 8640252. Its totient is φ = 8640250.

The previous prime is 8640241. The next prime is 8640259. The reversal of 8640251 is 1520468.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8640251 - 2⁶ = 8640187 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8640251.

It is not a weakly prime, because it can be changed into another prime (8640259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320125 + 4320126.

It is an arithmetic number, because the mean of its divisors is an integer number (4320126).

Almost surely, 2^8640251 is an apocalyptic number.

8640251 is a deficient number, since it is larger than the sum of its proper divisors (1).

8640251 is an equidigital number, since it uses as much as digits as its factorization.

8640251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 8640251 is about 2939.4303869968. The cubic root of 8640251 is about 205.1991006373.

The spelling of 8640251 in words is "eight million, six hundred forty thousand, two hundred fifty-one".