199221749 has 4 divisors (see below), whose sum is σ = 199665900. Its totient is φ = 198777600.

The previous prime is 199221731. The next prime is 199221761. The reversal of 199221749 is 947122991.

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 142324900 + 56896849 = 11930^2 + 7543^2 .

It is a cyclic number.

It is not a de Polignac number, because 199221749 - 2¹² = 199217653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199221719) 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, 221402 + ... + 222299.

It is an arithmetic number, because the mean of its divisors is an integer number (49916475).

Almost surely, 2^199221749 is an apocalyptic number.

It is an amenable number.

199221749 is a deficient number, since it is larger than the sum of its proper divisors (444151).

199221749 is an equidigital number, since it uses as much as digits as its factorization.

199221749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444150.

The product of its digits is 81648, while the sum is 44.

The square root of 199221749 is about 14114.5934762571. The cubic root of 199221749 is about 584.0440217097.

The spelling of 199221749 in words is "one hundred ninety-nine million, two hundred twenty-one thousand, seven hundred forty-nine".