189709019 has 2 divisors, whose sum is σ = 189709020. Its totient is φ = 189709018.

The previous prime is 189708997. The next prime is 189709049. The reversal of 189709019 is 910907981.

It is a weak prime.

It is an emirp because it is prime and its reverse (910907981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189709019 is a prime.

It is a super-2 number, since 2×189709019² = 71979023779884722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189709049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94854509 + 94854510.

It is an arithmetic number, because the mean of its divisors is an integer number (94854510).

Almost surely, 2^189709019 is an apocalyptic number.

189709019 is a deficient number, since it is larger than the sum of its proper divisors (1).

189709019 is an equidigital number, since it uses as much as digits as its factorization.

189709019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 189709019 is about 13773.4897175698. The cubic root of 189709019 is about 574.5960807873.

The spelling of 189709019 in words is "one hundred eighty-nine million, seven hundred nine thousand, nineteen".