561615101 has 4 divisors (see below), whose sum is σ = 568381632. Its totient is φ = 554848572.

The previous prime is 561615049. The next prime is 561615137. The reversal of 561615101 is 101516165.

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 cyclic number.

It is not a de Polignac number, because 561615101 - 2¹⁰ = 561614077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561615001) 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, 3383141 + ... + 3383306.

It is an arithmetic number, because the mean of its divisors is an integer number (142095408).

Almost surely, 2^561615101 is an apocalyptic number.

It is an amenable number.

561615101 is a deficient number, since it is larger than the sum of its proper divisors (6766531).

561615101 is an equidigital number, since it uses as much as digits as its factorization.

561615101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6766530.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 561615101 is about 23698.4197996407. The cubic root of 561615101 is about 825.0487150909.

The spelling of 561615101 in words is "five hundred sixty-one million, six hundred fifteen thousand, one hundred one".