168870019 has 2 divisors, whose sum is σ = 168870020. Its totient is φ = 168870018.

The previous prime is 168870017. The next prime is 168870029. The reversal of 168870019 is 910078861.

It is a weak prime.

It is an emirp because it is prime and its reverse (910078861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168870019 - 2¹ = 168870017 is a prime.

It is a super-2 number, since 2×168870019² = 57034166634120722, which contains 22 as substring.

Together with 168870017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (168870017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84435009 + 84435010.

It is an arithmetic number, because the mean of its divisors is an integer number (84435010).

Almost surely, 2^168870019 is an apocalyptic number.

168870019 is a deficient number, since it is larger than the sum of its proper divisors (1).

168870019 is an equidigital number, since it uses as much as digits as its factorization.

168870019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 168870019 is about 12994.9997691420. Note that the first 3 decimals coincide. The cubic root of 168870019 is about 552.7357022759.

The spelling of 168870019 in words is "one hundred sixty-eight million, eight hundred seventy thousand, nineteen".