189038321 has 2 divisors, whose sum is σ = 189038322. Its totient is φ = 189038320.

The previous prime is 189038287. The next prime is 189038347. The reversal of 189038321 is 123830981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140541025 + 48497296 = 11855^2 + 6964^2 .

It is a cyclic number.

It is not a de Polignac number, because 189038321 - 2⁶ = 189038257 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (189038921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94519160 + 94519161.

It is an arithmetic number, because the mean of its divisors is an integer number (94519161).

Almost surely, 2^189038321 is an apocalyptic number.

It is an amenable number.

189038321 is a deficient number, since it is larger than the sum of its proper divisors (1).

189038321 is an equidigital number, since it uses as much as digits as its factorization.

189038321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 189038321 is about 13749.1207355234. The cubic root of 189038321 is about 573.9181381555.

The spelling of 189038321 in words is "one hundred eighty-nine million, thirty-eight thousand, three hundred twenty-one".