506111081 has 4 divisors (see below), whose sum is σ = 578412672. Its totient is φ = 433809492.

The previous prime is 506111077. The next prime is 506111107. The reversal of 506111081 is 180111605.

It is a happy number.

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 506111081 - 2² = 506111077 is a prime.

It is a super-3 number, since 3×506111081³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (506113081) 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, 36150785 + ... + 36150798.

It is an arithmetic number, because the mean of its divisors is an integer number (144603168).

Almost surely, 2^506111081 is an apocalyptic number.

It is an amenable number.

506111081 is a deficient number, since it is larger than the sum of its proper divisors (72301591).

506111081 is an equidigital number, since it uses as much as digits as its factorization.

506111081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72301590.

The product of its (nonzero) digits is 240, while the sum is 23.

The square root of 506111081 is about 22496.9126993017. The cubic root of 506111081 is about 796.9210197409.

Adding to 506111081 its reverse (180111605), we get a palindrome (686222686).

The spelling of 506111081 in words is "five hundred six million, one hundred eleven thousand, eighty-one".