506071561 has 4 divisors (see below), whose sum is σ = 509765652. Its totient is φ = 502377472.

The previous prime is 506071549. The next prime is 506071567. The reversal of 506071561 is 165170605.

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 260209161 + 245862400 = 16131^2 + 15680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-506071561 is a prime.

It is a super-2 number, since 2×506071561² = 512216849705953442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (506071567) 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 3 ways as a sum of consecutive naturals, for example, 1846840 + ... + 1847113.

It is an arithmetic number, because the mean of its divisors is an integer number (127441413).

Almost surely, 2^506071561 is an apocalyptic number.

It is an amenable number.

506071561 is a deficient number, since it is larger than the sum of its proper divisors (3694091).

506071561 is a wasteful number, since it uses less digits than its factorization.

506071561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3694090.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 506071561 is about 22496.0343394119. The cubic root of 506071561 is about 796.9002765090.

The spelling of 506071561 in words is "five hundred six million, seventy-one thousand, five hundred sixty-one".