18061331 has 2 divisors, whose sum is σ = 18061332. Its totient is φ = 18061330.

The previous prime is 18061319. The next prime is 18061349. The reversal of 18061331 is 13316081.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18061331 is a prime.

It is a super-2 number, since 2×18061331² = 652423354983122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18061297 and 18061306.

It is not a weakly prime, because it can be changed into another prime (18064331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9030665 + 9030666.

It is an arithmetic number, because the mean of its divisors is an integer number (9030666).

Almost surely, 2^18061331 is an apocalyptic number.

18061331 is a deficient number, since it is larger than the sum of its proper divisors (1).

18061331 is an equidigital number, since it uses as much as digits as its factorization.

18061331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 18061331 is about 4249.8624683629. The cubic root of 18061331 is about 262.3714551275.

The spelling of 18061331 in words is "eighteen million, sixty-one thousand, three hundred thirty-one".