506131661 has 4 divisors (see below), whose sum is σ = 578436192. Its totient is φ = 433827132.

The previous prime is 506131657. The next prime is 506131723. The reversal of 506131661 is 166131605.

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 506131661 - 2² = 506131657 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 (506131061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36152255 + ... + 36152268.

It is an arithmetic number, because the mean of its divisors is an integer number (144609048).

Almost surely, 2^506131661 is an apocalyptic number.

It is an amenable number.

506131661 is a deficient number, since it is larger than the sum of its proper divisors (72304531).

506131661 is an equidigital number, since it uses as much as digits as its factorization.

506131661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72304530.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 506131661 is about 22497.3700907462. The cubic root of 506131661 is about 796.9318213303.

The spelling of 506131661 in words is "five hundred six million, one hundred thirty-one thousand, six hundred sixty-one".