18229691 has 2 divisors, whose sum is σ = 18229692. Its totient is φ = 18229690.

The previous prime is 18229681. The next prime is 18229709. The reversal of 18229691 is 19692281.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18229691 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18229621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9114845 + 9114846.

It is an arithmetic number, because the mean of its divisors is an integer number (9114846).

Almost surely, 2^18229691 is an apocalyptic number.

18229691 is a deficient number, since it is larger than the sum of its proper divisors (1).

18229691 is an equidigital number, since it uses as much as digits as its factorization.

18229691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 18229691 is about 4269.6242223409. The cubic root of 18229691 is about 263.1841732137.

The spelling of 18229691 in words is "eighteen million, two hundred twenty-nine thousand, six hundred ninety-one".