189991370329 has 2 divisors, whose sum is σ = 189991370330. Its totient is φ = 189991370328.

The previous prime is 189991370287. The next prime is 189991370339. The reversal of 189991370329 is 923073199981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149208375625 + 40782994704 = 386275^2 + 201948^2 .

It is a cyclic number.

It is not a de Polignac number, because 189991370329 - 2⁹ = 189991369817 is a prime.

It is not a weakly prime, because it can be changed into another prime (189991370339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94995685164 + 94995685165.

It is an arithmetic number, because the mean of its divisors is an integer number (94995685165).

Almost surely, 2^189991370329 is an apocalyptic number.

It is an amenable number.

189991370329 is a deficient number, since it is larger than the sum of its proper divisors (1).

189991370329 is an equidigital number, since it uses as much as digits as its factorization.

189991370329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6613488, while the sum is 61.

The spelling of 189991370329 in words is "one hundred eighty-nine billion, nine hundred ninety-one million, three hundred seventy thousand, three hundred twenty-nine".