25131121 has 4 divisors (see below), whose sum is σ = 25155700. Its totient is φ = 25106544.

The previous prime is 25131107. The next prime is 25131131. The reversal of 25131121 is 12113152.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19891600 + 5239521 = 4460^2 + 2289^2 .

It is a cyclic number.

It is not a de Polignac number, because 25131121 - 2⁷ = 25130993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25131095 and 25131104.

It is not an unprimeable number, because it can be changed into a prime (25131131) 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, 10686 + ... + 12823.

It is an arithmetic number, because the mean of its divisors is an integer number (6288925).

Almost surely, 2^25131121 is an apocalyptic number.

It is an amenable number.

25131121 is a deficient number, since it is larger than the sum of its proper divisors (24579).

25131121 is a wasteful number, since it uses less digits than its factorization.

25131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24578.

The product of its digits is 60, while the sum is 16.

The square root of 25131121 is about 5013.0949522226. The cubic root of 25131121 is about 292.9120828684.

Adding to 25131121 its reverse (12113152), we get a palindrome (37244273).

It can be divided in two parts, 25131 and 121, that added together give a palindrome (25252).

The spelling of 25131121 in words is "twenty-five million, one hundred thirty-one thousand, one hundred twenty-one".