189739549 has 2 divisors, whose sum is σ = 189739550. Its totient is φ = 189739548.

The previous prime is 189739519. The next prime is 189739559. The reversal of 189739549 is 945937981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159213924 + 30525625 = 12618^2 + 5525^2 .

It is an emirp because it is prime and its reverse (945937981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189739549 - 2⁹ = 189739037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189739549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189739519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94869774 + 94869775.

It is an arithmetic number, because the mean of its divisors is an integer number (94869775).

Almost surely, 2^189739549 is an apocalyptic number.

It is an amenable number.

189739549 is a deficient number, since it is larger than the sum of its proper divisors (1).

189739549 is an equidigital number, since it uses as much as digits as its factorization.

189739549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 55.

The square root of 189739549 is about 13774.5979614652. The cubic root of 189739549 is about 574.6269025119.

The spelling of 189739549 in words is "one hundred eighty-nine million, seven hundred thirty-nine thousand, five hundred forty-nine".