1813229549 has 2 divisors, whose sum is σ = 1813229550. Its totient is φ = 1813229548.

The previous prime is 1813229531. The next prime is 1813229629. The reversal of 1813229549 is 9459223181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1609453924 + 203775625 = 40118^2 + 14275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1813229549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1813229519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906614774 + 906614775.

It is an arithmetic number, because the mean of its divisors is an integer number (906614775).

Almost surely, 2^1813229549 is an apocalyptic number.

It is an amenable number.

1813229549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813229549 is an equidigital number, since it uses as much as digits as its factorization.

1813229549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 44.

The square root of 1813229549 is about 42582.0331712801. The cubic root of 1813229549 is about 1219.4133049784.

The spelling of 1813229549 in words is "one billion, eight hundred thirteen million, two hundred twenty-nine thousand, five hundred forty-nine".