199649961 has 24 divisors (see below), whose sum is σ = 344070240. Its totient is φ = 114084936.

The previous prime is 199649953. The next prime is 199650001. The reversal of 199649961 is 169946991.

199649961 is a `hidden beast` number, since 1 + 9 + 96 + 499 + 61 = 666.

It is not a de Polignac number, because 199649961 - 2³ = 199649953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199649898 and 199649907.

It is not an unprimeable number, because it can be changed into a prime (199645961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74131 + ... + 76776.

It is an arithmetic number, because the mean of its divisors is an integer number (14336260).

Almost surely, 2^199649961 is an apocalyptic number.

It is an amenable number.

199649961 is a deficient number, since it is larger than the sum of its proper divisors (144420279).

199649961 is a wasteful number, since it uses less digits than its factorization.

199649961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150930 (or 150917 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 199649961 is about 14129.7544564653. The cubic root of 199649961 is about 584.4621749938.

The spelling of 199649961 in words is "one hundred ninety-nine million, six hundred forty-nine thousand, nine hundred sixty-one".