18261049 has 2 divisors, whose sum is σ = 18261050. Its totient is φ = 18261048.

The previous prime is 18261041. The next prime is 18261059. The reversal of 18261049 is 94016281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9966649 + 8294400 = 3157^2 + 2880^2 .

It is a cyclic number.

It is not a de Polignac number, because 18261049 - 2³ = 18261041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18261049.

It is not a weakly prime, because it can be changed into another prime (18261041) 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, 9130524 + 9130525.

It is an arithmetic number, because the mean of its divisors is an integer number (9130525).

Almost surely, 2^18261049 is an apocalyptic number.

It is an amenable number.

18261049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18261049 is an equidigital number, since it uses as much as digits as its factorization.

18261049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18261049 is about 4273.2948646214. The cubic root of 18261049 is about 263.3349931352.

The spelling of 18261049 in words is "eighteen million, two hundred sixty-one thousand, forty-nine".