199210287961 has 4 divisors (see below), whose sum is σ = 210928540212. Its totient is φ = 187492035712.

The previous prime is 199210287907. The next prime is 199210288009. The reversal of 199210287961 is 169782012991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61583385600 + 137626902361 = 248160^2 + 370981^2 .

It is a cyclic number.

It is not a de Polignac number, because 199210287961 - 2¹¹ = 199210285913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199210287461) 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, 5859126100 + ... + 5859126133.

It is an arithmetic number, because the mean of its divisors is an integer number (52732135053).

Almost surely, 2^199210287961 is an apocalyptic number.

It is an amenable number.

199210287961 is a deficient number, since it is larger than the sum of its proper divisors (11718252251).

199210287961 is a wasteful number, since it uses less digits than its factorization.

199210287961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11718252250.

The product of its (nonzero) digits is 979776, while the sum is 55.

The spelling of 199210287961 in words is "one hundred ninety-nine billion, two hundred ten million, two hundred eighty-seven thousand, nine hundred sixty-one".