189749069 has 2 divisors, whose sum is σ = 189749070. Its totient is φ = 189749068.

The previous prime is 189749041. The next prime is 189749071. The reversal of 189749069 is 960947981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116424100 + 73324969 = 10790^2 + 8563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189749069 is a prime.

It is a super-2 number, since 2×189749069² = 72009418372733522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 189749071, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 189749069.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189749089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94874534 + 94874535.

It is an arithmetic number, because the mean of its divisors is an integer number (94874535).

Almost surely, 2^189749069 is an apocalyptic number.

It is an amenable number.

189749069 is a deficient number, since it is larger than the sum of its proper divisors (1).

189749069 is an equidigital number, since it uses as much as digits as its factorization.

189749069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 189749069 is about 13774.9435207554. The cubic root of 189749069 is about 574.6365128025.

The spelling of 189749069 in words is "one hundred eighty-nine million, seven hundred forty-nine thousand, sixty-nine".