18070561 has 2 divisors, whose sum is σ = 18070562. Its totient is φ = 18070560.

The previous prime is 18070553. The next prime is 18070573. The reversal of 18070561 is 16507081.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14776336 + 3294225 = 3844^2 + 1815^2 .

It is an emirp because it is prime and its reverse (16507081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18070561 - 2³ = 18070553 is a prime.

It is not a weakly prime, because it can be changed into another prime (18070361) 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, 9035280 + 9035281.

It is an arithmetic number, because the mean of its divisors is an integer number (9035281).

Almost surely, 2^18070561 is an apocalyptic number.

It is an amenable number.

18070561 is a deficient number, since it is larger than the sum of its proper divisors (1).

18070561 is an equidigital number, since it uses as much as digits as its factorization.

18070561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 18070561 is about 4250.9482471562. The cubic root of 18070561 is about 262.4161413160.

The spelling of 18070561 in words is "eighteen million, seventy thousand, five hundred sixty-one".