25505279 has 2 divisors, whose sum is σ = 25505280. Its totient is φ = 25505278.

The previous prime is 25505273. The next prime is 25505299. The reversal of 25505279 is 97250552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25505279 - 2⁸ = 25505023 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25505273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12752639 + 12752640.

It is an arithmetic number, because the mean of its divisors is an integer number (12752640).

Almost surely, 2^25505279 is an apocalyptic number.

25505279 is a deficient number, since it is larger than the sum of its proper divisors (1).

25505279 is an equidigital number, since it uses as much as digits as its factorization.

25505279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 25505279 is about 5050.2751410195. The cubic root of 25505279 is about 294.3585757068.

The spelling of 25505279 in words is "twenty-five million, five hundred five thousand, two hundred seventy-nine".