25213257 has 6 divisors (see below), whose sum is σ = 36419162. Its totient is φ = 16808832.

The previous prime is 25213241. The next prime is 25213271. The reversal of 25213257 is 75231252.

It can be written as a sum of positive squares in only one way, i.e., 23242041 + 1971216 = 4821^2 + 1404^2 .

It is not a de Polignac number, because 25213257 - 2⁴ = 25213241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25213257.

It is not an unprimeable number, because it can be changed into a prime (25213207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1400728 + ... + 1400745.

Almost surely, 2^25213257 is an apocalyptic number.

It is an amenable number.

25213257 is a deficient number, since it is larger than the sum of its proper divisors (11205905).

25213257 is a wasteful number, since it uses less digits than its factorization.

25213257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801479 (or 2801476 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 25213257 is about 5021.2804143963. The cubic root of 25213257 is about 293.2308438722.

It can be divided in two parts, 2521 and 3257, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 25213257 in words is "twenty-five million, two hundred thirteen thousand, two hundred fifty-seven".