199163561 has 8 divisors (see below), whose sum is σ = 212678400. Its totient is φ = 186091920.

The previous prime is 199163539. The next prime is 199163579. The reversal of 199163561 is 165361991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199163561 - 2¹⁴ = 199147177 is a prime.

It is a super-2 number, since 2×199163561² = 79332248060401442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199163501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109871 + ... + 111668.

It is an arithmetic number, because the mean of its divisors is an integer number (26584800).

Almost surely, 2^199163561 is an apocalyptic number.

It is an amenable number.

199163561 is a deficient number, since it is larger than the sum of its proper divisors (13514839).

199163561 is a wasteful number, since it uses less digits than its factorization.

199163561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221599.

The product of its digits is 43740, while the sum is 41.

The square root of 199163561 is about 14112.5320548795. The cubic root of 199163561 is about 583.9871543196.

The spelling of 199163561 in words is "one hundred ninety-nine million, one hundred sixty-three thousand, five hundred sixty-one".