25218157 has 16 divisors (see below), whose sum is σ = 27708912. Its totient is φ = 22855680.

The previous prime is 25218133. The next prime is 25218161. The reversal of 25218157 is 75181252.

It can be written as a sum of positive squares in 8 ways, for example, as 477481 + 24740676 = 691^2 + 4974^2 .

It is a cyclic number.

It is not a de Polignac number, because 25218157 - 2⁷ = 25218029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25218857) 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 15 ways as a sum of consecutive naturals, for example, 67423 + ... + 67795.

It is an arithmetic number, because the mean of its divisors is an integer number (1731807).

Almost surely, 2^25218157 is an apocalyptic number.

It is an amenable number.

25218157 is a deficient number, since it is larger than the sum of its proper divisors (2490755).

25218157 is a wasteful number, since it uses less digits than its factorization.

25218157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528.

The product of its digits is 5600, while the sum is 31.

The square root of 25218157 is about 5021.7683140503. The cubic root of 25218157 is about 293.2498383516.

The spelling of 25218157 in words is "twenty-five million, two hundred eighteen thousand, one hundred fifty-seven".