561099101 has 4 divisors (see below), whose sum is σ = 579199104. Its totient is φ = 542999100.

The previous prime is 561099079. The next prime is 561099107. The reversal of 561099101 is 101990165.

It is a happy number.

561099101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-561099101 is a prime.

It is a super-2 number, since 2×561099101² = 629664402286016402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561099107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9049955 + ... + 9050016.

It is an arithmetic number, because the mean of its divisors is an integer number (144799776).

Almost surely, 2^561099101 is an apocalyptic number.

It is an amenable number.

561099101 is a deficient number, since it is larger than the sum of its proper divisors (18100003).

561099101 is a wasteful number, since it uses less digits than its factorization.

561099101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18100002.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 561099101 is about 23687.5304960226. The cubic root of 561099101 is about 824.7959586003.

The spelling of 561099101 in words is "five hundred sixty-one million, ninety-nine thousand, one hundred one".