189181429 has 2 divisors, whose sum is σ = 189181430. Its totient is φ = 189181428.

The previous prime is 189181411. The next prime is 189181477. The reversal of 189181429 is 924181981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104080804 + 85100625 = 10202^2 + 9225^2 .

It is an emirp because it is prime and its reverse (924181981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189181429 - 2⁵ = 189181397 is a prime.

It is a super-2 number, since 2×189181429² = 71579226156964082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189181409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94590714 + 94590715.

It is an arithmetic number, because the mean of its divisors is an integer number (94590715).

Almost surely, 2^189181429 is an apocalyptic number.

It is an amenable number.

189181429 is a deficient number, since it is larger than the sum of its proper divisors (1).

189181429 is an equidigital number, since it uses as much as digits as its factorization.

189181429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 43.

The square root of 189181429 is about 13754.3240110156. The cubic root of 189181429 is about 574.0629263650.

The spelling of 189181429 in words is "one hundred eighty-nine million, one hundred eighty-one thousand, four hundred twenty-nine".