25215251 has 2 divisors, whose sum is σ = 25215252. Its totient is φ = 25215250.

The previous prime is 25215221. The next prime is 25215263. The reversal of 25215251 is 15251252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25215251 - 2⁶ = 25215187 is a prime.

It is not a weakly prime, because it can be changed into another prime (25215221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12607625 + 12607626.

It is an arithmetic number, because the mean of its divisors is an integer number (12607626).

Almost surely, 2^25215251 is an apocalyptic number.

25215251 is a deficient number, since it is larger than the sum of its proper divisors (1).

25215251 is an equidigital number, since it uses as much as digits as its factorization.

25215251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000, while the sum is 23.

The square root of 25215251 is about 5021.4789654045. The cubic root of 25215251 is about 293.2385737593.

The spelling of 25215251 in words is "twenty-five million, two hundred fifteen thousand, two hundred fifty-one".