18633161 has 2 divisors, whose sum is σ = 18633162. Its totient is φ = 18633160.

The previous prime is 18633149. The next prime is 18633191. The reversal of 18633161 is 16133681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11971600 + 6661561 = 3460^2 + 2581^2 .

It is an emirp because it is prime and its reverse (16133681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18633161 - 2¹⁴ = 18616777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18633101) 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, 9316580 + 9316581.

It is an arithmetic number, because the mean of its divisors is an integer number (9316581).

Almost surely, 2^18633161 is an apocalyptic number.

It is an amenable number.

18633161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18633161 is an equidigital number, since it uses as much as digits as its factorization.

18633161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 18633161 is about 4316.6145299297. The cubic root of 18633161 is about 265.1116700358. Note that the first 3 decimals are identical.

The spelling of 18633161 in words is "eighteen million, six hundred thirty-three thousand, one hundred sixty-one".