189973129 has 2 divisors, whose sum is σ = 189973130. Its totient is φ = 189973128.

The previous prime is 189973127. The next prime is 189973219. The reversal of 189973129 is 921379981.

Together with next prime (189973219) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189117504 + 855625 = 13752^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 189973129 - 2¹ = 189973127 is a prime.

Together with 189973127, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (189973127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94986564 + 94986565.

It is an arithmetic number, because the mean of its divisors is an integer number (94986565).

Almost surely, 2^189973129 is an apocalyptic number.

It is an amenable number.

189973129 is a deficient number, since it is larger than the sum of its proper divisors (1).

189973129 is an equidigital number, since it uses as much as digits as its factorization.

189973129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 49.

The square root of 189973129 is about 13783.0740040094. The cubic root of 189973129 is about 574.8626051056.

The spelling of 189973129 in words is "one hundred eighty-nine million, nine hundred seventy-three thousand, one hundred twenty-nine".