1999587841 has 2 divisors, whose sum is σ = 1999587842. Its totient is φ = 1999587840.

The previous prime is 1999587833. The next prime is 1999587853. The reversal of 1999587841 is 1487859991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1944457216 + 55130625 = 44096^2 + 7425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1999587841 - 2³ = 1999587833 is a prime.

It is a super-3 number, since 3×1999587841³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1999587841.

It is not a weakly prime, because it can be changed into another prime (1999587871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999793920 + 999793921.

It is an arithmetic number, because the mean of its divisors is an integer number (999793921).

Almost surely, 2^1999587841 is an apocalyptic number.

It is an amenable number.

1999587841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999587841 is an equidigital number, since it uses as much as digits as its factorization.

1999587841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 61.

The square root of 1999587841 is about 44716.7512348560. The cubic root of 1999587841 is about 1259.8344959823.

The spelling of 1999587841 in words is "one billion, nine hundred ninety-nine million, five hundred eighty-seven thousand, eight hundred forty-one".