1999838501 has 2 divisors, whose sum is σ = 1999838502. Its totient is φ = 1999838500.

The previous prime is 1999838479. The next prime is 1999838507. The reversal of 1999838501 is 1058389991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1564281601 + 435556900 = 39551^2 + 20870^2 .

It is an emirp because it is prime and its reverse (1058389991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1999838501 - 2¹⁴ = 1999822117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999838507) 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, 999919250 + 999919251.

It is an arithmetic number, because the mean of its divisors is an integer number (999919251).

Almost surely, 2^1999838501 is an apocalyptic number.

It is an amenable number.

1999838501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999838501 is an equidigital number, since it uses as much as digits as its factorization.

1999838501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 53.

The square root of 1999838501 is about 44719.5538998322. The cubic root of 1999838501 is about 1259.8871363171.

The spelling of 1999838501 in words is "one billion, nine hundred ninety-nine million, eight hundred thirty-eight thousand, five hundred one".