25981115 has 4 divisors (see below), whose sum is σ = 31177344. Its totient is φ = 20784888.

The previous prime is 25981097. The next prime is 25981121. The reversal of 25981115 is 51118952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25981115 - 2⁶ = 25981051 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 2598107 + ... + 2598116.

It is an arithmetic number, because the mean of its divisors is an integer number (7794336).

Almost surely, 2^25981115 is an apocalyptic number.

25981115 is a deficient number, since it is larger than the sum of its proper divisors (5196229).

25981115 is an equidigital number, since it uses as much as digits as its factorization.

25981115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196228.

The product of its digits is 3600, while the sum is 32.

The square root of 25981115 is about 5097.1673505978. The cubic root of 25981115 is about 296.1778628801.

The spelling of 25981115 in words is "twenty-five million, nine hundred eighty-one thousand, one hundred fifteen".