18690601 has 2 divisors, whose sum is σ = 18690602. Its totient is φ = 18690600.

The previous prime is 18690589. The next prime is 18690611. The reversal of 18690601 is 10609681.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15023376 + 3667225 = 3876^2 + 1915^2 .

It is an emirp because it is prime and its reverse (10609681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18690601 - 2⁵ = 18690569 is a prime.

It is not a weakly prime, because it can be changed into another prime (18690611) 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, 9345300 + 9345301.

It is an arithmetic number, because the mean of its divisors is an integer number (9345301).

Almost surely, 2^18690601 is an apocalyptic number.

It is an amenable number.

18690601 is a deficient number, since it is larger than the sum of its proper divisors (1).

18690601 is an equidigital number, since it uses as much as digits as its factorization.

18690601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 18690601 is about 4323.2627724902. The cubic root of 18690601 is about 265.3838083916.

It can be divided in two parts, 18690 and 601, that added together give a palindrome (19291).

The spelling of 18690601 in words is "eighteen million, six hundred ninety thousand, six hundred one".