25131641 has 4 divisors (see below), whose sum is σ = 25146192. Its totient is φ = 25117092.

The previous prime is 25131629. The next prime is 25131671. The reversal of 25131641 is 14613152.

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 not a de Polignac number, because 25131641 - 2¹⁴ = 25115257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25131611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4271 + ... + 8276.

It is an arithmetic number, because the mean of its divisors is an integer number (6286548).

Almost surely, 2^25131641 is an apocalyptic number.

It is an amenable number.

25131641 is a deficient number, since it is larger than the sum of its proper divisors (14551).

25131641 is a wasteful number, since it uses less digits than its factorization.

25131641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14550.

The product of its digits is 720, while the sum is 23.

The square root of 25131641 is about 5013.1468161226. The cubic root of 25131641 is about 292.9141031157.

Adding to 25131641 its reverse (14613152), we get a palindrome (39744793).

The spelling of 25131641 in words is "twenty-five million, one hundred thirty-one thousand, six hundred forty-one".