506651561 has 8 divisors (see below), whose sum is σ = 577720584. Its totient is φ = 440167680.

The previous prime is 506651533. The next prime is 506651603. The reversal of 506651561 is 165156605.

It can be written as a sum of positive squares in 4 ways, for example, as 1795600 + 504855961 = 1340^2 + 22469^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 506651561 - 2¹⁰ = 506650537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (506651531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1146050 + ... + 1146491.

It is an arithmetic number, because the mean of its divisors is an integer number (72215073).

Almost surely, 2^506651561 is an apocalyptic number.

It is an amenable number.

506651561 is a deficient number, since it is larger than the sum of its proper divisors (71069023).

506651561 is a wasteful number, since it uses less digits than its factorization.

506651561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292571.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 506651561 is about 22508.9218089183. The cubic root of 506651561 is about 797.2045982257.

The spelling of 506651561 in words is "five hundred six million, six hundred fifty-one thousand, five hundred sixty-one".