18556049 has 2 divisors, whose sum is σ = 18556050. Its totient is φ = 18556048.

The previous prime is 18556039. The next prime is 18556079. The reversal of 18556049 is 94065581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 66049 = 4300^2 + 257^2 .

It is a cyclic number.

It is not a de Polignac number, because 18556049 - 2⁸ = 18555793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18556039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9278024 + 9278025.

It is an arithmetic number, because the mean of its divisors is an integer number (9278025).

Almost surely, 2^18556049 is an apocalyptic number.

It is an amenable number.

18556049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18556049 is an equidigital number, since it uses as much as digits as its factorization.

18556049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 18556049 is about 4307.6732698755. The cubic root of 18556049 is about 264.7454491685.

The spelling of 18556049 in words is "eighteen million, five hundred fifty-six thousand, forty-nine".