199961929 has 2 divisors, whose sum is σ = 199961930. Its totient is φ = 199961928.

The previous prime is 199961899. The next prime is 199961933. The reversal of 199961929 is 929169991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172869904 + 27092025 = 13148^2 + 5205^2 .

It is an emirp because it is prime and its reverse (929169991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199961929 - 2⁹ = 199961417 is a prime.

It is a super-3 number, since 3×199961929³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 199961929.

It is not a weakly prime, because it can be changed into another prime (199962929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99980964 + 99980965.

It is an arithmetic number, because the mean of its divisors is an integer number (99980965).

Almost surely, 2^199961929 is an apocalyptic number.

It is an amenable number.

199961929 is a deficient number, since it is larger than the sum of its proper divisors (1).

199961929 is an equidigital number, since it uses as much as digits as its factorization.

199961929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 708588, while the sum is 55.

The square root of 199961929 is about 14140.7895465564. The cubic root of 199961929 is about 584.7664385281.

The spelling of 199961929 in words is "one hundred ninety-nine million, nine hundred sixty-one thousand, nine hundred twenty-nine".