25418261 has 4 divisors (see below), whose sum is σ = 27729024. Its totient is φ = 23107500.

The previous prime is 25418251. The next prime is 25418269. The reversal of 25418261 is 16281452.

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 25418261 - 2¹⁰ = 25417237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25418269) 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, 1155365 + ... + 1155386.

It is an arithmetic number, because the mean of its divisors is an integer number (6932256).

Almost surely, 2^25418261 is an apocalyptic number.

It is an amenable number.

25418261 is a deficient number, since it is larger than the sum of its proper divisors (2310763).

25418261 is a wasteful number, since it uses less digits than its factorization.

25418261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310762.

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

The square root of 25418261 is about 5041.6526060410. The cubic root of 25418261 is about 294.0234335834.

The spelling of 25418261 in words is "twenty-five million, four hundred eighteen thousand, two hundred sixty-one".