189071321 has 2 divisors, whose sum is σ = 189071322. Its totient is φ = 189071320.

The previous prime is 189071273. The next prime is 189071347. The reversal of 189071321 is 123170981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136305625 + 52765696 = 11675^2 + 7264^2 .

It is a cyclic number.

It is not a de Polignac number, because 189071321 - 2⁶ = 189071257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189071381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94535660 + 94535661.

It is an arithmetic number, because the mean of its divisors is an integer number (94535661).

Almost surely, 2^189071321 is an apocalyptic number.

It is an amenable number.

189071321 is a deficient number, since it is larger than the sum of its proper divisors (1).

189071321 is an equidigital number, since it uses as much as digits as its factorization.

189071321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 189071321 is about 13750.3207598950. The cubic root of 189071321 is about 573.9515320842.

The spelling of 189071321 in words is "one hundred eighty-nine million, seventy-one thousand, three hundred twenty-one".