199077861 has 8 divisors (see below), whose sum is σ = 267027264. Its totient is φ = 131923520.

The previous prime is 199077829. The next prime is 199077869. The reversal of 199077861 is 168770991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199077861 - 2⁵ = 199077829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199077861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199077869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198180 + ... + 199181.

It is an arithmetic number, because the mean of its divisors is an integer number (33378408).

Almost surely, 2^199077861 is an apocalyptic number.

It is an amenable number.

199077861 is a deficient number, since it is larger than the sum of its proper divisors (67949403).

199077861 is a wasteful number, since it uses less digits than its factorization.

199077861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397531.

The product of its (nonzero) digits is 190512, while the sum is 48.

The square root of 199077861 is about 14109.4954197519. The cubic root of 199077861 is about 583.9033791567.

The spelling of 199077861 in words is "one hundred ninety-nine million, seventy-seven thousand, eight hundred sixty-one".