25861861 has 4 divisors (see below), whose sum is σ = 25876224. Its totient is φ = 25847500.

The previous prime is 25861859. The next prime is 25861873. The reversal of 25861861 is 16816852.

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 25861861 - 2¹ = 25861859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25861861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25867861) 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, 4015 + ... + 8236.

It is an arithmetic number, because the mean of its divisors is an integer number (6469056).

Almost surely, 2^25861861 is an apocalyptic number.

It is an amenable number.

25861861 is a deficient number, since it is larger than the sum of its proper divisors (14363).

25861861 is a wasteful number, since it uses less digits than its factorization.

25861861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14362.

The product of its digits is 23040, while the sum is 37.

The square root of 25861861 is about 5085.4558301100. The cubic root of 25861861 is about 295.7240130537.

The spelling of 25861861 in words is "twenty-five million, eight hundred sixty-one thousand, eight hundred sixty-one".