25561401 has 8 divisors (see below), whose sum is σ = 34192704. Its totient is φ = 16985520.

The previous prime is 25561369. The next prime is 25561411. The reversal of 25561401 is 10416552.

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

It is not a de Polignac number, because 25561401 - 2⁵ = 25561369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25561411) 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, 12766 + ... + 14631.

It is an arithmetic number, because the mean of its divisors is an integer number (4274088).

Almost surely, 2^25561401 is an apocalyptic number.

It is an amenable number.

25561401 is a deficient number, since it is larger than the sum of its proper divisors (8631303).

25561401 is a wasteful number, since it uses less digits than its factorization.

25561401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27711.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 25561401 is about 5055.8284187658. The cubic root of 25561401 is about 294.5743204536.

Adding to 25561401 its reverse (10416552), we get a palindrome (35977953).

The spelling of 25561401 in words is "twenty-five million, five hundred sixty-one thousand, four hundred one".