199494349409 has 2 divisors, whose sum is σ = 199494349410. Its totient is φ = 199494349408.

The previous prime is 199494349367. The next prime is 199494349429. The reversal of 199494349409 is 904943494991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158744871184 + 40749478225 = 398428^2 + 201865^2 .

It is a cyclic number.

It is not a de Polignac number, because 199494349409 - 2³² = 195199382113 is a prime.

It is a super-2 number, since 2×199494349409² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199494349429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99747174704 + 99747174705.

It is an arithmetic number, because the mean of its divisors is an integer number (99747174705).

Almost surely, 2^199494349409 is an apocalyptic number.

It is an amenable number.

199494349409 is a deficient number, since it is larger than the sum of its proper divisors (1).

199494349409 is an equidigital number, since it uses as much as digits as its factorization.

199494349409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45349632, while the sum is 65.

The spelling of 199494349409 in words is "one hundred ninety-nine billion, four hundred ninety-four million, three hundred forty-nine thousand, four hundred nine".