18136633 has 2 divisors, whose sum is σ = 18136634. Its totient is φ = 18136632.

The previous prime is 18136609. The next prime is 18136667. The reversal of 18136633 is 33663181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16386304 + 1750329 = 4048^2 + 1323^2 .

It is a cyclic number.

It is not a de Polignac number, because 18136633 - 2¹³ = 18128441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18136595 and 18136604.

It is not a weakly prime, because it can be changed into another prime (18136693) 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, 9068316 + 9068317.

It is an arithmetic number, because the mean of its divisors is an integer number (9068317).

Almost surely, 2^18136633 is an apocalyptic number.

It is an amenable number.

18136633 is a deficient number, since it is larger than the sum of its proper divisors (1).

18136633 is an equidigital number, since it uses as much as digits as its factorization.

18136633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 18136633 is about 4258.7125988965. The cubic root of 18136633 is about 262.7355792958.

It can be divided in two parts, 18136 and 633, that added together give a square (18769 = 137²).

The spelling of 18136633 in words is "eighteen million, one hundred thirty-six thousand, six hundred thirty-three".