18355061 has 2 divisors, whose sum is σ = 18355062. Its totient is φ = 18355060.

The previous prime is 18355039. The next prime is 18355063. The reversal of 18355061 is 16055381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18190225 + 164836 = 4265^2 + 406^2 .

It is a cyclic number.

It is not a de Polignac number, because 18355061 - 2¹⁸ = 18092917 is a prime.

Together with 18355063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18355063) 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, 9177530 + 9177531.

It is an arithmetic number, because the mean of its divisors is an integer number (9177531).

Almost surely, 2^18355061 is an apocalyptic number.

It is an amenable number.

18355061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18355061 is an equidigital number, since it uses as much as digits as its factorization.

18355061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 18355061 is about 4284.2806864163. The cubic root of 18355061 is about 263.7861224980.

The spelling of 18355061 in words is "eighteen million, three hundred fifty-five thousand, sixty-one".