25861871 has 4 divisors (see below), whose sum is σ = 29556432. Its totient is φ = 22167312.

The previous prime is 25861859. The next prime is 25861873. The reversal of 25861871 is 17816852.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25861871 - 2¹⁰ = 25860847 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 (25861873) 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, 1847270 + ... + 1847283.

It is an arithmetic number, because the mean of its divisors is an integer number (7389108).

Almost surely, 2^25861871 is an apocalyptic number.

25861871 is a deficient number, since it is larger than the sum of its proper divisors (3694561).

25861871 is an equidigital number, since it uses as much as digits as its factorization.

25861871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3694560.

The product of its digits is 26880, while the sum is 38.

The square root of 25861871 is about 5085.4568133060. The cubic root of 25861871 is about 295.7240511695.

The spelling of 25861871 in words is "twenty-five million, eight hundred sixty-one thousand, eight hundred seventy-one".