505115231 has 8 divisors (see below), whose sum is σ = 519782544. Its totient is φ = 490501440.

The previous prime is 505115201. The next prime is 505115249. The reversal of 505115231 is 132511505.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505115231 is a prime.

It is a super-2 number, since 2×505115231² = 510282793176366722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505115197 and 505115206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505115201) 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, 6176 + ... + 32378.

It is an arithmetic number, because the mean of its divisors is an integer number (64972818).

Almost surely, 2^505115231 is an apocalyptic number.

505115231 is a deficient number, since it is larger than the sum of its proper divisors (14667313).

505115231 is a wasteful number, since it uses less digits than its factorization.

505115231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26761.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 505115231 is about 22474.7687641052. The cubic root of 505115231 is about 796.3979890496.

Adding to 505115231 its reverse (132511505), we get a palindrome (637626736).

The spelling of 505115231 in words is "five hundred five million, one hundred fifteen thousand, two hundred thirty-one".