199989529 has 2 divisors, whose sum is σ = 199989530. Its totient is φ = 199989528.

The previous prime is 199989509. The next prime is 199989541. The reversal of 199989529 is 925989991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151659225 + 48330304 = 12315^2 + 6952^2 .

It is an emirp because it is prime and its reverse (925989991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199989529 - 2¹⁵ = 199956761 is a prime.

It is not a weakly prime, because it can be changed into another prime (199989509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99994764 + 99994765.

It is an arithmetic number, because the mean of its divisors is an integer number (99994765).

Almost surely, 2^199989529 is an apocalyptic number.

It is an amenable number.

199989529 is a deficient number, since it is larger than the sum of its proper divisors (1).

199989529 is an equidigital number, since it uses as much as digits as its factorization.

199989529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4723920, while the sum is 61.

The square root of 199989529 is about 14141.7654131300. The cubic root of 199989529 is about 584.7933416679.

The spelling of 199989529 in words is "one hundred ninety-nine million, nine hundred eighty-nine thousand, five hundred twenty-nine".