18699361 has 2 divisors, whose sum is σ = 18699362. Its totient is φ = 18699360.

The previous prime is 18699349. The next prime is 18699377. The reversal of 18699361 is 16399681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11861136 + 6838225 = 3444^2 + 2615^2 .

It is an emirp because it is prime and its reverse (16399681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18699361 - 2¹¹ = 18697313 is a prime.

It is a super-2 number, since 2×18699361² = 699332203616642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18699311) 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, 9349680 + 9349681.

It is an arithmetic number, because the mean of its divisors is an integer number (9349681).

Almost surely, 2^18699361 is an apocalyptic number.

It is an amenable number.

18699361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18699361 is an equidigital number, since it uses as much as digits as its factorization.

18699361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 18699361 is about 4324.2757775147. The cubic root of 18699361 is about 265.4252623656.

The spelling of 18699361 in words is "eighteen million, six hundred ninety-nine thousand, three hundred sixty-one".