25211257 has 4 divisors (see below), whose sum is σ = 25221456. Its totient is φ = 25201060.

The previous prime is 25211227. The next prime is 25211261. The reversal of 25211257 is 75211252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25211257 - 2¹⁹ = 24686969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25211227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1218 + ... + 7204.

It is an arithmetic number, because the mean of its divisors is an integer number (6305364).

Almost surely, 2^25211257 is an apocalyptic number.

It is an amenable number.

25211257 is a deficient number, since it is larger than the sum of its proper divisors (10199).

25211257 is an equidigital number, since it uses as much as digits as its factorization.

25211257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10198.

The product of its digits is 1400, while the sum is 25.

The square root of 25211257 is about 5021.0812580559. The cubic root of 25211257 is about 293.2230903163.

The spelling of 25211257 in words is "twenty-five million, two hundred eleven thousand, two hundred fifty-seven".