561021099 has 8 divisors (see below), whose sum is σ = 749135760. Its totient is φ = 373460256.

The previous prime is 561021077. The next prime is 561021101. The reversal of 561021099 is 990120165.

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

It is not a de Polignac number, because 561021099 - 2⁵ = 561021067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561021049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136084 + ... + 140145.

It is an arithmetic number, because the mean of its divisors is an integer number (93641970).

Almost surely, 2^561021099 is an apocalyptic number.

561021099 is a deficient number, since it is larger than the sum of its proper divisors (188114661).

561021099 is a wasteful number, since it uses less digits than its factorization.

561021099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276909.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 561021099 is about 23685.8839607054. The cubic root of 561021099 is about 824.7577367629.

The spelling of 561021099 in words is "five hundred sixty-one million, twenty-one thousand, ninety-nine".