561310061 has 4 divisors (see below), whose sum is σ = 604487772. Its totient is φ = 518132352.

The previous prime is 561310039. The next prime is 561310081. The reversal of 561310061 is 160013165.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 187854436 + 373455625 = 13706^2 + 19325^2 .

It is a cyclic number.

It is not a de Polignac number, because 561310061 - 2¹⁰ = 561309037 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 (561310021) 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, 21588836 + ... + 21588861.

It is an arithmetic number, because the mean of its divisors is an integer number (151121943).

Almost surely, 2^561310061 is an apocalyptic number.

It is an amenable number.

561310061 is a deficient number, since it is larger than the sum of its proper divisors (43177711).

561310061 is a wasteful number, since it uses less digits than its factorization.

561310061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43177710.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 561310061 is about 23691.9830533453. The cubic root of 561310061 is about 824.8993135770.

The spelling of 561310061 in words is "five hundred sixty-one million, three hundred ten thousand, sixty-one".