25218497 has 8 divisors (see below), whose sum is σ = 27424296. Its totient is φ = 23092992.

The previous prime is 25218493. The next prime is 25218521. The reversal of 25218497 is 79481252.

It can be written as a sum of positive squares in 4 ways, for example, as 5779216 + 19439281 = 2404^2 + 4409^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25218497 - 2² = 25218493 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 25218497.

It is not an unprimeable number, because it can be changed into a prime (25218493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19418 + ... + 20675.

It is an arithmetic number, because the mean of its divisors is an integer number (3428037).

Almost surely, 2^25218497 is an apocalyptic number.

It is an amenable number.

25218497 is a deficient number, since it is larger than the sum of its proper divisors (2205799).

25218497 is a wasteful number, since it uses less digits than its factorization.

25218497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40147.

The product of its digits is 40320, while the sum is 38.

The square root of 25218497 is about 5021.8021665534. The cubic root of 25218497 is about 293.2511562445.

The spelling of 25218497 in words is "twenty-five million, two hundred eighteen thousand, four hundred ninety-seven".