18070081 has 2 divisors, whose sum is σ = 18070082. Its totient is φ = 18070080.

The previous prime is 18070069. The next prime is 18070093. The reversal of 18070081 is 18007081.

It is a balanced prime because it is at equal distance from previous prime (18070069) and next prime (18070093).

It can be written as a sum of positive squares in only one way, i.e., 13727025 + 4343056 = 3705^2 + 2084^2 .

It is a cyclic number.

It is not a de Polignac number, because 18070081 - 2¹¹ = 18068033 is a prime.

It is a super-2 number, since 2×18070081² = 653055654693122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18070001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9035040 + 9035041.

It is an arithmetic number, because the mean of its divisors is an integer number (9035041).

Almost surely, 2^18070081 is an apocalyptic number.

18070081 is the 2689-th centered pentagonal number.

It is an amenable number.

18070081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18070081 is an equidigital number, since it uses as much as digits as its factorization.

18070081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 18070081 is about 4250.8917887897. The cubic root of 18070081 is about 262.4138178157.

The spelling of 18070081 in words is "eighteen million, seventy thousand, eighty-one".