25617257 has 4 divisors (see below), whose sum is σ = 25643136. Its totient is φ = 25591380.

The previous prime is 25617211. The next prime is 25617259. The reversal of 25617257 is 75271652.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25617257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25617259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11393 + ... + 13454.

It is an arithmetic number, because the mean of its divisors is an integer number (6410784).

Almost surely, 2^25617257 is an apocalyptic number.

It is an amenable number.

25617257 is a deficient number, since it is larger than the sum of its proper divisors (25879).

25617257 is a wasteful number, since it uses less digits than its factorization.

25617257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25878.

The product of its digits is 29400, while the sum is 35.

The square root of 25617257 is about 5061.3493260197. The cubic root of 25617257 is about 294.7887293199.

The spelling of 25617257 in words is "twenty-five million, six hundred seventeen thousand, two hundred fifty-seven".