1999987079 has 2 divisors, whose sum is σ = 1999987080. Its totient is φ = 1999987078.

The previous prime is 1999987021. The next prime is 1999987097. The reversal of 1999987079 is 9707899991.

Together with next prime (1999987097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (9707899991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1999987079 - 2¹² = 1999982983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999987009) 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, 999993539 + 999993540.

It is an arithmetic number, because the mean of its divisors is an integer number (999993540).

Almost surely, 2^1999987079 is an apocalyptic number.

1999987079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999987079 is an equidigital number, since it uses as much as digits as its factorization.

1999987079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23147208, while the sum is 68.

The square root of 1999987079 is about 44721.2150885908. The cubic root of 1999987079 is about 1259.9183366490.

The spelling of 1999987079 in words is "one billion, nine hundred ninety-nine million, nine hundred eighty-seven thousand, seventy-nine".