25539891 has 16 divisors (see below), whose sum is σ = 36960000. Its totient is φ = 15593760.

The previous prime is 25539887. The next prime is 25539911. The reversal of 25539891 is 19893552.

It is not a de Polignac number, because 25539891 - 2² = 25539887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25539841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2610 + ... + 7608.

It is an arithmetic number, because the mean of its divisors is an integer number (2310000).

Almost surely, 2^25539891 is an apocalyptic number.

25539891 is a deficient number, since it is larger than the sum of its proper divisors (11420109).

25539891 is a wasteful number, since it uses less digits than its factorization.

25539891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5146.

The product of its digits is 97200, while the sum is 42.

The square root of 25539891 is about 5053.7007232324. The cubic root of 25539891 is about 294.4916688571.

The spelling of 25539891 in words is "twenty-five million, five hundred thirty-nine thousand, eight hundred ninety-one".