18131025 has 24 divisors (see below), whose sum is σ = 32703264. Its totient is φ = 8790400.

The previous prime is 18131017. The next prime is 18131039. The reversal of 18131025 is 52013181.

18131025 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 18131025 - 2³ = 18131017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18130992 and 18131010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10164 + ... + 11813.

It is an arithmetic number, because the mean of its divisors is an integer number (1362636).

Almost surely, 2^18131025 is an apocalyptic number.

18131025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18131025 is a deficient number, since it is larger than the sum of its proper divisors (14572239).

18131025 is a wasteful number, since it uses less digits than its factorization.

18131025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22001 (or 21996 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 18131025 is about 4258.0541330519. The cubic root of 18131025 is about 262.7084964847.

The spelling of 18131025 in words is "eighteen million, one hundred thirty-one thousand, twenty-five".