25218859 has 2 divisors, whose sum is σ = 25218860. Its totient is φ = 25218858.

The previous prime is 25218857. The next prime is 25218877. The reversal of 25218859 is 95881252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25218859 - 2¹ = 25218857 is a prime.

Together with 25218857, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25218857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12609429 + 12609430.

It is an arithmetic number, because the mean of its divisors is an integer number (12609430).

Almost surely, 2^25218859 is an apocalyptic number.

25218859 is a deficient number, since it is larger than the sum of its proper divisors (1).

25218859 is an equidigital number, since it uses as much as digits as its factorization.

25218859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 40.

The square root of 25218859 is about 5021.8382092616. The cubic root of 25218859 is about 293.2525593999.

The spelling of 25218859 in words is "twenty-five million, two hundred eighteen thousand, eight hundred fifty-nine".