199561049 has 16 divisors (see below), whose sum is σ = 207365760. Its totient is φ = 191963520.

The previous prime is 199561003. The next prime is 199561067. The reversal of 199561049 is 940165991.

It is a cyclic number.

It is not a de Polignac number, because 199561049 - 2²⁰ = 198512473 is a prime.

It is a super-2 number, since 2×199561049² = 79649224555960802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199581049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720299 + ... + 720575.

It is an arithmetic number, because the mean of its divisors is an integer number (12960360).

Almost surely, 2^199561049 is an apocalyptic number.

It is an amenable number.

199561049 is a deficient number, since it is larger than the sum of its proper divisors (7804711).

199561049 is a wasteful number, since it uses less digits than its factorization.

199561049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 199561049 is about 14126.6078376941. The cubic root of 199561049 is about 584.3754007604.

The spelling of 199561049 in words is "one hundred ninety-nine million, five hundred sixty-one thousand, forty-nine".