1618855229 has 2 divisors, whose sum is σ = 1618855230. Its totient is φ = 1618855228.

The previous prime is 1618855219. The next prime is 1618855279. The reversal of 1618855229 is 9225588161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1618855225 + 4 = 40235^2 + 2^2 .

It is an emirp because it is prime and its reverse (9225588161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1618855229 - 2⁸ = 1618854973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1618855219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809427614 + 809427615.

It is an arithmetic number, because the mean of its divisors is an integer number (809427615).

Almost surely, 2^1618855229 is an apocalyptic number.

It is an amenable number.

1618855229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618855229 is an equidigital number, since it uses as much as digits as its factorization.

1618855229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 47.

The square root of 1618855229 is about 40235.0000497080. Note that the first 4 decimals coincide. The cubic root of 1618855229 is about 1174.1835835232.

It can be divided in two parts, 16188 and 55229, that added together give a palindrome (71417).

The spelling of 1618855229 in words is "one billion, six hundred eighteen million, eight hundred fifty-five thousand, two hundred twenty-nine".