25171213 has 2 divisors, whose sum is σ = 25171214. Its totient is φ = 25171212.

The previous prime is 25171207. The next prime is 25171231. The reversal of 25171213 is 31217152.

It is a happy number.

Together with next prime (25171231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23687689 + 1483524 = 4867^2 + 1218^2 .

It is a cyclic number.

It is not a de Polignac number, because 25171213 - 2⁹ = 25170701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25171313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12585606 + 12585607.

It is an arithmetic number, because the mean of its divisors is an integer number (12585607).

Almost surely, 2^25171213 is an apocalyptic number.

It is an amenable number.

25171213 is a deficient number, since it is larger than the sum of its proper divisors (1).

25171213 is an equidigital number, since it uses as much as digits as its factorization.

25171213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 22.

The square root of 25171213 is about 5017.0920860594. The cubic root of 25171213 is about 293.0677622475.

Adding to 25171213 its reverse (31217152), we get a palindrome (56388365).

The spelling of 25171213 in words is "twenty-five million, one hundred seventy-one thousand, two hundred thirteen".