25931089 has 4 divisors (see below), whose sum is σ = 25942000. Its totient is φ = 25920180.

The previous prime is 25931083. The next prime is 25931099. The reversal of 25931089 is 98013952.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25931089 - 2⁹ = 25930577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25931083) 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 3 ways as a sum of consecutive naturals, for example, 207 + ... + 7204.

It is an arithmetic number, because the mean of its divisors is an integer number (6485500).

Almost surely, 2^25931089 is an apocalyptic number.

It is an amenable number.

25931089 is a deficient number, since it is larger than the sum of its proper divisors (10911).

25931089 is an equidigital number, since it uses as much as digits as its factorization.

25931089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10910.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 25931089 is about 5092.2577507428. The cubic root of 25931089 is about 295.9876463374.

The spelling of 25931089 in words is "twenty-five million, nine hundred thirty-one thousand, eighty-nine".