189505619 has 2 divisors, whose sum is σ = 189505620. Its totient is φ = 189505618.

The previous prime is 189505607. The next prime is 189505621. The reversal of 189505619 is 916505981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189505619 - 2¹² = 189501523 is a prime.

It is a super-2 number, since 2×189505619² = 71824759265146322, which contains 22 as substring.

Together with 189505621, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189505619.

It is not a weakly prime, because it can be changed into another prime (189505669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94752809 + 94752810.

It is an arithmetic number, because the mean of its divisors is an integer number (94752810).

Almost surely, 2^189505619 is an apocalyptic number.

189505619 is a deficient number, since it is larger than the sum of its proper divisors (1).

189505619 is an equidigital number, since it uses as much as digits as its factorization.

189505619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 44.

The square root of 189505619 is about 13766.1039876938. The cubic root of 189505619 is about 574.3906527806.

The spelling of 189505619 in words is "one hundred eighty-nine million, five hundred five thousand, six hundred nineteen".