25991125 has 16 divisors (see below), whose sum is σ = 32585904. Its totient is φ = 20697600.

The previous prime is 25991111. The next prime is 25991129. The reversal of 25991125 is 52119952.

It can be written as a sum of positive squares in 8 ways, for example, as 19158129 + 6832996 = 4377^2 + 2614^2 .

It is not a de Polignac number, because 25991125 - 2⁷ = 25990997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25991129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41817 + ... + 42433.

It is an arithmetic number, because the mean of its divisors is an integer number (2036619).

Almost surely, 2^25991125 is an apocalyptic number.

25991125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25991125 is a deficient number, since it is larger than the sum of its proper divisors (6594779).

25991125 is an equidigital number, since it uses as much as digits as its factorization.

25991125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969 (or 959 counting only the distinct ones).

The product of its digits is 8100, while the sum is 34.

The square root of 25991125 is about 5098.1491739650. The cubic root of 25991125 is about 296.2158951167.

The spelling of 25991125 in words is "twenty-five million, nine hundred ninety-one thousand, one hundred twenty-five".