25218329 has 2 divisors, whose sum is σ = 25218330. Its totient is φ = 25218328.

The previous prime is 25218317. The next prime is 25218433. The reversal of 25218329 is 92381252.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18705625 + 6512704 = 4325^2 + 2552^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25218329 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 25218295 and 25218304.

It is not a weakly prime, because it can be changed into another prime (25218029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12609164 + 12609165.

It is an arithmetic number, because the mean of its divisors is an integer number (12609165).

Almost surely, 2^25218329 is an apocalyptic number.

It is an amenable number.

25218329 is a deficient number, since it is larger than the sum of its proper divisors (1).

25218329 is an equidigital number, since it uses as much as digits as its factorization.

25218329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 25218329 is about 5021.7854394627. The cubic root of 25218329 is about 293.2505050518.

It can be divided in two parts, 252 and 18329, that added together give a palindrome (18581).

The spelling of 25218329 in words is "twenty-five million, two hundred eighteen thousand, three hundred twenty-nine".