561742061 has 4 divisors (see below), whose sum is σ = 568852800. Its totient is φ = 554631324.

The previous prime is 561742037. The next prime is 561742109. The reversal of 561742061 is 160247165.

561742061 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 cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561742061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561742001) 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, 3555251 + ... + 3555408.

It is an arithmetic number, because the mean of its divisors is an integer number (142213200).

Almost surely, 2^561742061 is an apocalyptic number.

It is an amenable number.

561742061 is a deficient number, since it is larger than the sum of its proper divisors (7110739).

561742061 is an equidigital number, since it uses as much as digits as its factorization.

561742061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7110738.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 561742061 is about 23701.0983078844. The cubic root of 561742061 is about 825.1108812094.

The spelling of 561742061 in words is "five hundred sixty-one million, seven hundred forty-two thousand, sixty-one".