18525081 has 4 divisors (see below), whose sum is σ = 24700112. Its totient is φ = 12350052.

The previous prime is 18525079. The next prime is 18525119. The reversal of 18525081 is 18052581.

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 an emirpimes, since its reverse is a distinct semiprime: 18052581 = 3 ⋅6017527.

It is not a de Polignac number, because 18525081 - 2¹ = 18525079 is a prime.

It is a super-2 number, since 2×18525081² = 686357252113122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18525041) 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, 3087511 + ... + 3087516.

It is an arithmetic number, because the mean of its divisors is an integer number (6175028).

Almost surely, 2^18525081 is an apocalyptic number.

It is an amenable number.

18525081 is a deficient number, since it is larger than the sum of its proper divisors (6175031).

18525081 is an equidigital number, since it uses as much as digits as its factorization.

18525081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6175030.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 18525081 is about 4304.0772530242. The cubic root of 18525081 is about 264.5980901738.

The spelling of 18525081 in words is "eighteen million, five hundred twenty-five thousand, eighty-one".