189305719 has 2 divisors, whose sum is σ = 189305720. Its totient is φ = 189305718.

The previous prime is 189305681. The next prime is 189305723. The reversal of 189305719 is 917503981.

It is a strong prime.

It is an emirp because it is prime and its reverse (917503981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189305719 - 2¹³ = 189297527 is a prime.

It is a super-2 number, since 2×189305719² = 71673310492213922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189305749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94652859 + 94652860.

It is an arithmetic number, because the mean of its divisors is an integer number (94652860).

Almost surely, 2^189305719 is an apocalyptic number.

189305719 is a deficient number, since it is larger than the sum of its proper divisors (1).

189305719 is an equidigital number, since it uses as much as digits as its factorization.

189305719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 189305719 is about 13758.8414846600. The cubic root of 189305719 is about 574.1886164001.

It can be divided in two parts, 18930 and 5719, that added together give a square (24649 = 157²).

The spelling of 189305719 in words is "one hundred eighty-nine million, three hundred five thousand, seven hundred nineteen".