25212251 has 2 divisors, whose sum is σ = 25212252. Its totient is φ = 25212250.

The previous prime is 25212227. The next prime is 25212277. The reversal of 25212251 is 15221252.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25212251 - 2¹⁰ = 25211227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (25212851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12606125 + 12606126.

It is an arithmetic number, because the mean of its divisors is an integer number (12606126).

Almost surely, 2^25212251 is an apocalyptic number.

25212251 is a deficient number, since it is larger than the sum of its proper divisors (1).

25212251 is an equidigital number, since it uses as much as digits as its factorization.

25212251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 400, while the sum is 20.

The square root of 25212251 is about 5021.1802397444. The cubic root of 25212251 is about 293.2269438849.

Subtracting from 25212251 its reverse (15221252), we obtain a palindrome (9990999).

The spelling of 25212251 in words is "twenty-five million, two hundred twelve thousand, two hundred fifty-one".