25431641 has 4 divisors (see below), whose sum is σ = 25449984. Its totient is φ = 25413300.

The previous prime is 25431631. The next prime is 25431673. The reversal of 25431641 is 14613452.

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 25431641 - 2⁶ = 25431577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25431641.

It is not an unprimeable number, because it can be changed into a prime (25431611) 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, 6905 + ... + 9926.

It is an arithmetic number, because the mean of its divisors is an integer number (6362496).

Almost surely, 2^25431641 is an apocalyptic number.

It is an amenable number.

25431641 is a deficient number, since it is larger than the sum of its proper divisors (18343).

25431641 is a wasteful number, since it uses less digits than its factorization.

25431641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18342.

The product of its digits is 2880, while the sum is 26.

The square root of 25431641 is about 5042.9793773126. The cubic root of 25431641 is about 294.0750151801.

The spelling of 25431641 in words is "twenty-five million, four hundred thirty-one thousand, six hundred forty-one".