861199201 has 4 divisors (see below), whose sum is σ = 861264900. Its totient is φ = 861133504.

The previous prime is 861199153. The next prime is 861199211. The reversal of 861199201 is 102991168.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 645109201 + 216090000 = 25399^2 + 14700^2 .

It is a cyclic number.

It is not a de Polignac number, because 861199201 - 2¹¹ = 861197153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861199211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5716 + ... + 41893.

It is an arithmetic number, because the mean of its divisors is an integer number (215316225).

Almost surely, 2^861199201 is an apocalyptic number.

It is an amenable number.

861199201 is a deficient number, since it is larger than the sum of its proper divisors (65699).

861199201 is a wasteful number, since it uses less digits than its factorization.

861199201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65698.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 861199201 is about 29346.1956818938. The cubic root of 861199201 is about 951.4103524567.

The spelling of 861199201 in words is "eight hundred sixty-one million, one hundred ninety-nine thousand, two hundred one".