18063691 has 2 divisors, whose sum is σ = 18063692. Its totient is φ = 18063690.

The previous prime is 18063653. The next prime is 18063697. The reversal of 18063691 is 19636081.

It is a strong prime.

It is an emirp because it is prime and its reverse (19636081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18063691 - 2¹¹ = 18061643 is a prime.

It is not a weakly prime, because it can be changed into another prime (18063697) 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, 9031845 + 9031846.

It is an arithmetic number, because the mean of its divisors is an integer number (9031846).

Almost surely, 2^18063691 is an apocalyptic number.

18063691 is a deficient number, since it is larger than the sum of its proper divisors (1).

18063691 is an equidigital number, since it uses as much as digits as its factorization.

18063691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 18063691 is about 4250.1401153374. The cubic root of 18063691 is about 262.3828822969.

The spelling of 18063691 in words is "eighteen million, sixty-three thousand, six hundred ninety-one".