25128961 has 8 divisors (see below), whose sum is σ = 29522304. Its totient is φ = 21087120.

The previous prime is 25128947. The next prime is 25128977. The reversal of 25128961 is 16982152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25128961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25128911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87721 + ... + 88006.

It is an arithmetic number, because the mean of its divisors is an integer number (3690288).

Almost surely, 2^25128961 is an apocalyptic number.

It is an amenable number.

25128961 is a deficient number, since it is larger than the sum of its proper divisors (4393343).

25128961 is a wasteful number, since it uses less digits than its factorization.

25128961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175751.

The product of its digits is 8640, while the sum is 34.

The square root of 25128961 is about 5012.8795118175. The cubic root of 25128961 is about 292.9036907739.

The spelling of 25128961 in words is "twenty-five million, one hundred twenty-eight thousand, nine hundred sixty-one".