199142649 has 12 divisors (see below), whose sum is σ = 290617236. Its totient is φ = 131392512.

The previous prime is 199142639. The next prime is 199142651. The reversal of 199142649 is 946241991.

It can be written as a sum of positive squares in 2 ways, for example, as 140849424 + 58293225 = 11868^2 + 7635^2 .

It is not a de Polignac number, because 199142649 - 2⁸ = 199142393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199142639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113184 + ... + 114929.

It is an arithmetic number, because the mean of its divisors is an integer number (24218103).

Almost surely, 2^199142649 is an apocalyptic number.

It is an amenable number.

199142649 is a deficient number, since it is larger than the sum of its proper divisors (91474587).

199142649 is a wasteful number, since it uses less digits than its factorization.

199142649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228216 (or 228213 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 199142649 is about 14111.7911336584. The cubic root of 199142649 is about 583.9667142238.

The spelling of 199142649 in words is "one hundred ninety-nine million, one hundred forty-two thousand, six hundred forty-nine".