25218641 has 8 divisors (see below), whose sum is σ = 28872960. Its totient is φ = 21577248.

The previous prime is 25218607. The next prime is 25218647. The reversal of 25218641 is 14681252.

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

It is not a de Polignac number, because 25218641 - 2⁶ = 25218577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25218647) 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, 1400 + ... + 7238.

It is an arithmetic number, because the mean of its divisors is an integer number (3609120).

Almost surely, 2^25218641 is an apocalyptic number.

It is an amenable number.

25218641 is a deficient number, since it is larger than the sum of its proper divisors (3654319).

25218641 is an equidigital number, since it uses as much as digits as its factorization.

25218641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6463.

The product of its digits is 3840, while the sum is 29.

The square root of 25218641 is about 5021.8165040153. The cubic root of 25218641 is about 293.2517144074.

Adding to 25218641 its reverse (14681252), we get a palindrome (39899893).

The spelling of 25218641 in words is "twenty-five million, two hundred eighteen thousand, six hundred forty-one".