25204861 has 4 divisors (see below), whose sum is σ = 27496224. Its totient is φ = 22913500.

The previous prime is 25204843. The next prime is 25204867. The reversal of 25204861 is 16840252.

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 25204861 - 2¹⁹ = 24680573 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 (25204867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1145665 + ... + 1145686.

It is an arithmetic number, because the mean of its divisors is an integer number (6874056).

Almost surely, 2^25204861 is an apocalyptic number.

It is an amenable number.

25204861 is a deficient number, since it is larger than the sum of its proper divisors (2291363).

25204861 is a wasteful number, since it uses less digits than its factorization.

25204861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2291362.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 25204861 is about 5020.4443030473. Note that the first 3 decimals coincide. The cubic root of 25204861 is about 293.1982916915.

It can be divided in two parts, 2520 and 4861, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 25204861 in words is "twenty-five million, two hundred four thousand, eight hundred sixty-one".