1800244991 has 2 divisors, whose sum is σ = 1800244992. Its totient is φ = 1800244990.

The previous prime is 1800244987. The next prime is 1800245071. The reversal of 1800244991 is 1994420081.

It is a weak prime.

It is an emirp because it is prime and its reverse (1994420081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1800244991 - 2² = 1800244987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1800244921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900122495 + 900122496.

It is an arithmetic number, because the mean of its divisors is an integer number (900122496).

Almost surely, 2^1800244991 is an apocalyptic number.

1800244991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800244991 is an equidigital number, since it uses as much as digits as its factorization.

1800244991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1800244991 is about 42429.2940195804. The cubic root of 1800244991 is about 1216.4955849351.

The spelling of 1800244991 in words is "one billion, eight hundred million, two hundred forty-four thousand, nine hundred ninety-one".