25871121 has 6 divisors (see below), whose sum is σ = 37369410. Its totient is φ = 17247408.

The previous prime is 25871117. The next prime is 25871147. The reversal of 25871121 is 12117852.

It can be written as a sum of positive squares in only one way, i.e., 25553025 + 318096 = 5055^2 + 564^2 .

It is not a de Polignac number, because 25871121 - 2² = 25871117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25871101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1437276 + ... + 1437293.

It is an arithmetic number, because the mean of its divisors is an integer number (6228235).

Almost surely, 2^25871121 is an apocalyptic number.

It is an amenable number.

25871121 is a deficient number, since it is larger than the sum of its proper divisors (11498289).

25871121 is a wasteful number, since it uses less digits than its factorization.

25871121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2874575 (or 2874572 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 25871121 is about 5086.3661881544. The cubic root of 25871121 is about 295.7593041153.

Adding to 25871121 its reverse (12117852), we get a palindrome (37988973).

The spelling of 25871121 in words is "twenty-five million, eight hundred seventy-one thousand, one hundred twenty-one".