189423281 has 2 divisors, whose sum is σ = 189423282. Its totient is φ = 189423280.

The previous prime is 189423263. The next prime is 189423287. The reversal of 189423281 is 182324981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143400625 + 46022656 = 11975^2 + 6784^2 .

It is a cyclic number.

It is not a de Polignac number, because 189423281 - 2¹⁰ = 189422257 is a prime.

It is a super-2 number, since 2×189423281² = 71762358769609922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (189423287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94711640 + 94711641.

It is an arithmetic number, because the mean of its divisors is an integer number (94711641).

Almost surely, 2^189423281 is an apocalyptic number.

It is an amenable number.

189423281 is a deficient number, since it is larger than the sum of its proper divisors (1).

189423281 is an equidigital number, since it uses as much as digits as its factorization.

189423281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 189423281 is about 13763.1130562820. The cubic root of 189423281 is about 574.3074520308.

The spelling of 189423281 in words is "one hundred eighty-nine million, four hundred twenty-three thousand, two hundred eighty-one".