199056865 has 12 divisors (see below), whose sum is σ = 277867476. Its totient is φ = 136495968.

The previous prime is 199056857. The next prime is 199056883. The reversal of 199056865 is 568650991.

It can be written as a sum of positive squares in 2 ways, for example, as 154554624 + 44502241 = 12432^2 + 6671^2 .

It is not a de Polignac number, because 199056865 - 2³ = 199056857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405994 + ... + 406483.

It is an arithmetic number, because the mean of its divisors is an integer number (23155623).

Almost surely, 2^199056865 is an apocalyptic number.

It is an amenable number.

199056865 is a deficient number, since it is larger than the sum of its proper divisors (78810611).

199056865 is an equidigital number, since it uses as much as digits as its factorization.

199056865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812496 (or 812489 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 199056865 is about 14108.7513621865. The cubic root of 199056865 is about 583.8828510639.

The spelling of 199056865 in words is "one hundred ninety-nine million, fifty-six thousand, eight hundred sixty-five".