999870019 has 2 divisors, whose sum is σ = 999870020. Its totient is φ = 999870018.

The previous prime is 999870017. The next prime is 999870023. The reversal of 999870019 is 910078999.

It is a weak prime.

It is an emirp because it is prime and its reverse (910078999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999870019 - 2¹ = 999870017 is a prime.

It is a super-2 number, since 2×999870019² = 1999480109790120722, which contains 22 as substring.

Together with 999870017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (999870017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499935009 + 499935010.

It is an arithmetic number, because the mean of its divisors is an integer number (499935010).

Almost surely, 2^999870019 is an apocalyptic number.

999870019 is a deficient number, since it is larger than the sum of its proper divisors (1).

999870019 is an equidigital number, since it uses as much as digits as its factorization.

999870019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 999870019 is about 31620.7213548331. The cubic root of 999870019 is about 999.9566711226.

The spelling of 999870019 in words is "nine hundred ninety-nine million, eight hundred seventy thousand, nineteen".