561821199 has 8 divisors (see below), whose sum is σ = 750049920. Its totient is φ = 374069976.

The previous prime is 561821191. The next prime is 561821251. The reversal of 561821199 is 991128165.

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

It is not a de Polignac number, because 561821199 - 2³ = 561821191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561821199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561821191) 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, 116619 + ... + 121340.

It is an arithmetic number, because the mean of its divisors is an integer number (93756240).

Almost surely, 2^561821199 is an apocalyptic number.

561821199 is a deficient number, since it is larger than the sum of its proper divisors (188228721).

561821199 is a wasteful number, since it uses less digits than its factorization.

561821199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238749.

The product of its digits is 38880, while the sum is 42.

The square root of 561821199 is about 23702.7677497798. The cubic root of 561821199 is about 825.1496264885.

The spelling of 561821199 in words is "five hundred sixty-one million, eight hundred twenty-one thousand, one hundred ninety-nine".