25287961 has 4 divisors (see below), whose sum is σ = 25306624. Its totient is φ = 25269300.

The previous prime is 25287953. The next prime is 25287967. The reversal of 25287961 is 16978252.

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 a cyclic number.

It is not a de Polignac number, because 25287961 - 2³ = 25287953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25287967) 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, 7125 + ... + 10066.

It is an arithmetic number, because the mean of its divisors is an integer number (6326656).

Almost surely, 2^25287961 is an apocalyptic number.

It is an amenable number.

25287961 is a deficient number, since it is larger than the sum of its proper divisors (18663).

25287961 is a wasteful number, since it uses less digits than its factorization.

25287961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18662.

The product of its digits is 60480, while the sum is 40.

The square root of 25287961 is about 5028.7136526153. The cubic root of 25287961 is about 293.5201614851.

The spelling of 25287961 in words is "twenty-five million, two hundred eighty-seven thousand, nine hundred sixty-one".