199722291409 has 9 divisors (see below), whose sum is σ = 202318187547. Its totient is φ = 197159302704.

The previous prime is 199722291407. The next prime is 199722291451. The reversal of 199722291409 is 904192227991.

The square root of 199722291409 is 446903.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 19885230225 + 179837061184 = 141015^2 + 424072^2 .

It is not a de Polignac number, because 199722291409 - 2¹ = 199722291407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199722291409.

It is not an unprimeable number, because it can be changed into a prime (199722291407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 35302509 + ... + 35308165.

Almost surely, 2^199722291409 is an apocalyptic number.

199722291409 is the 446903-rd square number.

199722291409 is the 223452-nd centered octagonal number.

It is an amenable number.

199722291409 is a deficient number, since it is larger than the sum of its proper divisors (2595896138).

199722291409 is an frugal number, since it uses more digits than its factorization.

199722291409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11472 (or 5736 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 55.

The spelling of 199722291409 in words is "one hundred ninety-nine billion, seven hundred twenty-two million, two hundred ninety-one thousand, four hundred nine".