25218811 has 2 divisors, whose sum is σ = 25218812. Its totient is φ = 25218810.

The previous prime is 25218797. The next prime is 25218857. The reversal of 25218811 is 11881252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25218811 - 2⁹ = 25218299 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25218811.

It is not a weakly prime, because it can be changed into another prime (25219811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12609405 + 12609406.

It is an arithmetic number, because the mean of its divisors is an integer number (12609406).

Almost surely, 2^25218811 is an apocalyptic number.

25218811 is a deficient number, since it is larger than the sum of its proper divisors (1).

25218811 is an equidigital number, since it uses as much as digits as its factorization.

25218811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 28.

The square root of 25218811 is about 5021.8334301329. The cubic root of 25218811 is about 293.2523733470.

The spelling of 25218811 in words is "twenty-five million, two hundred eighteen thousand, eight hundred eleven".