189223381 has 2 divisors, whose sum is σ = 189223382. Its totient is φ = 189223380.

The previous prime is 189223361. The next prime is 189223393. The reversal of 189223381 is 183322981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188622756 + 600625 = 13734^2 + 775^2 .

It is an emirp because it is prime and its reverse (183322981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189223381 - 2²⁷ = 55005653 is a prime.

It is a super-2 number, since 2×189223381² = 71610975834142322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189223381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189223361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94611690 + 94611691.

It is an arithmetic number, because the mean of its divisors is an integer number (94611691).

Almost surely, 2^189223381 is an apocalyptic number.

It is an amenable number.

189223381 is a deficient number, since it is larger than the sum of its proper divisors (1).

189223381 is an equidigital number, since it uses as much as digits as its factorization.

189223381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 189223381 is about 13755.8489741637. The cubic root of 189223381 is about 574.1053570765.

The spelling of 189223381 in words is "one hundred eighty-nine million, two hundred twenty-three thousand, three hundred eighty-one".