25145121 has 4 divisors (see below), whose sum is σ = 33526832. Its totient is φ = 16763412.

The previous prime is 25145053. The next prime is 25145129. The reversal of 25145121 is 12154152.

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 not a de Polignac number, because 25145121 - 2¹⁷ = 25014049 is a prime.

It is a super-2 number, since 2×25145121² = 1264554220209282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25145129) 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, 4190851 + ... + 4190856.

It is an arithmetic number, because the mean of its divisors is an integer number (8381708).

Almost surely, 2^25145121 is an apocalyptic number.

It is an amenable number.

25145121 is a deficient number, since it is larger than the sum of its proper divisors (8381711).

25145121 is an equidigital number, since it uses as much as digits as its factorization.

25145121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8381710.

The product of its digits is 400, while the sum is 21.

The square root of 25145121 is about 5014.4911007998. The cubic root of 25145121 is about 292.9664644181.

Adding to 25145121 its reverse (12154152), we get a palindrome (37299273).

The spelling of 25145121 in words is "twenty-five million, one hundred forty-five thousand, one hundred twenty-one".