18081025 has 12 divisors (see below), whose sum is σ = 22521004. Its totient is φ = 14400000.

The previous prime is 18081023. The next prime is 18081031. The reversal of 18081025 is 52018081.

It can be written as a sum of positive squares in 6 ways, for example, as 1521 + 18079504 = 39^2 + 4252^2 .

It is not a de Polignac number, because 18081025 - 2¹ = 18081023 is a prime.

It is a super-3 number, since 3×18081025³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18081023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4525 + ... + 7525.

Almost surely, 2^18081025 is an apocalyptic number.

It is an amenable number.

18081025 is a deficient number, since it is larger than the sum of its proper divisors (4439979).

18081025 is a wasteful number, since it uses less digits than its factorization.

18081025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3252 (or 3247 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 18081025 is about 4252.1788532469. The cubic root of 18081025 is about 262.4667834009.

The spelling of 18081025 in words is "eighteen million, eighty-one thousand, twenty-five".