1800539869 has 2 divisors, whose sum is σ = 1800539870. Its totient is φ = 1800539868.

The previous prime is 1800539863. The next prime is 1800539893. The reversal of 1800539869 is 9689350081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1744064644 + 56475225 = 41762^2 + 7515^2 .

It is an emirp because it is prime and its reverse (9689350081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1800539869 - 2⁵ = 1800539837 is a prime.

It is a super-2 number, since 2×1800539869² = 6483887639717074322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1800539863) 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, 900269934 + 900269935.

It is an arithmetic number, because the mean of its divisors is an integer number (900269935).

Almost surely, 2^1800539869 is an apocalyptic number.

It is an amenable number.

1800539869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800539869 is an equidigital number, since it uses as much as digits as its factorization.

1800539869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 1800539869 is about 42432.7688113797. The cubic root of 1800539869 is about 1216.5620014882.

The spelling of 1800539869 in words is "one billion, eight hundred million, five hundred thirty-nine thousand, eight hundred sixty-nine".