18409051 has 2 divisors, whose sum is σ = 18409052. Its totient is φ = 18409050.

The previous prime is 18409033. The next prime is 18409109. The reversal of 18409051 is 15090481.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18409051 - 2¹¹ = 18407003 is a prime.

It is not a weakly prime, because it can be changed into another prime (18400051) 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, 9204525 + 9204526.

It is an arithmetic number, because the mean of its divisors is an integer number (9204526).

Almost surely, 2^18409051 is an apocalyptic number.

18409051 is a deficient number, since it is larger than the sum of its proper divisors (1).

18409051 is an equidigital number, since it uses as much as digits as its factorization.

18409051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 18409051 is about 4290.5770008240. The cubic root of 18409051 is about 264.0445048554.

The spelling of 18409051 in words is "eighteen million, four hundred nine thousand, fifty-one".