199957049 has 4 divisors (see below), whose sum is σ = 200254836. Its totient is φ = 199659264.

The previous prime is 199957019. The next prime is 199957057. The reversal of 199957049 is 940759991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 940759991 = 17 ⋅55338823.

It can be written as a sum of positive squares in 2 ways, for example, as 90859024 + 109098025 = 9532^2 + 10445^2 .

It is a cyclic number.

It is not a de Polignac number, because 199957049 - 2⁸ = 199956793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199957019) 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, 147884 + ... + 149229.

It is an arithmetic number, because the mean of its divisors is an integer number (50063709).

Almost surely, 2^199957049 is an apocalyptic number.

It is an amenable number.

199957049 is a deficient number, since it is larger than the sum of its proper divisors (297787).

199957049 is an equidigital number, since it uses as much as digits as its factorization.

199957049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297786.

The product of its (nonzero) digits is 918540, while the sum is 53.

The square root of 199957049 is about 14140.6169950254. The cubic root of 199957049 is about 584.7616814835.

The spelling of 199957049 in words is "one hundred ninety-nine million, nine hundred fifty-seven thousand, forty-nine".