25218013 has 2 divisors, whose sum is σ = 25218014. Its totient is φ = 25218012.

The previous prime is 25217989. The next prime is 25218019. The reversal of 25218013 is 31081252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24970009 + 248004 = 4997^2 + 498^2 .

It is a cyclic number.

It is not a de Polignac number, because 25218013 - 2⁵ = 25217981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25218019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12609006 + 12609007.

It is an arithmetic number, because the mean of its divisors is an integer number (12609007).

Almost surely, 2^25218013 is an apocalyptic number.

It is an amenable number.

25218013 is a deficient number, since it is larger than the sum of its proper divisors (1).

25218013 is an equidigital number, since it uses as much as digits as its factorization.

25218013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 25218013 is about 5021.7539764509. The cubic root of 25218013 is about 293.2492801815.

Adding to 25218013 its reverse (31081252), we get a palindrome (56299265).

The spelling of 25218013 in words is "twenty-five million, two hundred eighteen thousand, thirteen".