18306081 has 10 divisors (see below), whose sum is σ = 27346242. Its totient is φ = 12204000.

The previous prime is 18306053. The next prime is 18306121. The reversal of 18306081 is 18060381.

It can be written as a sum of positive squares in only one way, i.e., 14561856 + 3744225 = 3816^2 + 1935^2 .

It is not a de Polignac number, because 18306081 - 2⁶ = 18306017 is a prime.

It is a super-2 number, since 2×18306081² = 670225203157122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18306011) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 112920 + ... + 113081.

Almost surely, 2^18306081 is an apocalyptic number.

It is an amenable number.

18306081 is a deficient number, since it is larger than the sum of its proper divisors (9040161).

18306081 is an equidigital number, since it uses as much as digits as its factorization.

18306081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226013 (or 226004 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18306081 is about 4278.5606224524. The cubic root of 18306081 is about 263.5512780266.

It can be divided in two parts, 1830608 and 1, that added together give a square (1830609 = 1353²).

The spelling of 18306081 in words is "eighteen million, three hundred six thousand, eighty-one".