199143761 has 4 divisors (see below), whose sum is σ = 199218852. Its totient is φ = 199068672.

The previous prime is 199143751. The next prime is 199143767. The reversal of 199143761 is 167341991.

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 129254161 + 69889600 = 11369^2 + 8360^2 .

It is a cyclic number.

It is not a de Polignac number, because 199143761 - 2¹⁰ = 199142737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199143767) 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, 33416 + ... + 38921.

It is an arithmetic number, because the mean of its divisors is an integer number (49804713).

Almost surely, 2^199143761 is an apocalyptic number.

It is an amenable number.

199143761 is a deficient number, since it is larger than the sum of its proper divisors (75091).

199143761 is an equidigital number, since it uses as much as digits as its factorization.

199143761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75090.

The product of its digits is 40824, while the sum is 41.

The square root of 199143761 is about 14111.8305332795. The cubic root of 199143761 is about 583.9678011662.

The spelling of 199143761 in words is "one hundred ninety-nine million, one hundred forty-three thousand, seven hundred sixty-one".