189451289 has 2 divisors, whose sum is σ = 189451290. Its totient is φ = 189451288.

The previous prime is 189451271. The next prime is 189451303. The reversal of 189451289 is 982154981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180499225 + 8952064 = 13435^2 + 2992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189451289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189453289) 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, 94725644 + 94725645.

It is an arithmetic number, because the mean of its divisors is an integer number (94725645).

Almost surely, 2^189451289 is an apocalyptic number.

It is an amenable number.

189451289 is a deficient number, since it is larger than the sum of its proper divisors (1).

189451289 is an equidigital number, since it uses as much as digits as its factorization.

189451289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 47.

The square root of 189451289 is about 13764.1305210318. The cubic root of 189451289 is about 574.3357562081.

The spelling of 189451289 in words is "one hundred eighty-nine million, four hundred fifty-one thousand, two hundred eighty-nine".