25129261 has 4 divisors (see below), whose sum is σ = 25603452. Its totient is φ = 24655072.

The previous prime is 25129259. The next prime is 25129289. The reversal of 25129261 is 16292152.

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 19980900 + 5148361 = 4470^2 + 2269^2 .

It is a cyclic number.

It is not a de Polignac number, because 25129261 - 2¹ = 25129259 is a prime.

It is a super-2 number, since 2×25129261² = 1262959516812242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25129231) 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, 237016 + ... + 237121.

It is an arithmetic number, because the mean of its divisors is an integer number (6400863).

Almost surely, 2^25129261 is an apocalyptic number.

It is an amenable number.

25129261 is a deficient number, since it is larger than the sum of its proper divisors (474191).

25129261 is an equidigital number, since it uses as much as digits as its factorization.

25129261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474190.

The product of its digits is 2160, while the sum is 28.

The square root of 25129261 is about 5012.9094346497. The cubic root of 25129261 is about 292.9048563714.

It can be divided in two parts, 25 and 129261, that added together give a triangular number (129286 = T₅₀₈).

The spelling of 25129261 in words is "twenty-five million, one hundred twenty-nine thousand, two hundred sixty-one".