25122817 has 2 divisors, whose sum is σ = 25122818. Its totient is φ = 25122816.

The previous prime is 25122809. The next prime is 25122827. The reversal of 25122817 is 71822152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16573041 + 8549776 = 4071^2 + 2924^2 .

It is a cyclic number.

It is not a de Polignac number, because 25122817 - 2³ = 25122809 is a prime.

It is not a weakly prime, because it can be changed into another prime (25122827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12561408 + 12561409.

It is an arithmetic number, because the mean of its divisors is an integer number (12561409).

Almost surely, 2^25122817 is an apocalyptic number.

It is an amenable number.

25122817 is a deficient number, since it is larger than the sum of its proper divisors (1).

25122817 is an equidigital number, since it uses as much as digits as its factorization.

25122817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 28.

The square root of 25122817 is about 5012.2666529226. The cubic root of 25122817 is about 292.8798172977.

Adding to 25122817 its reverse (71822152), we get a palindrome (96944969).

It can be divided in two parts, 2512 and 2817, that added together give a square (5329 = 73²).

The spelling of 25122817 in words is "twenty-five million, one hundred twenty-two thousand, eight hundred seventeen".