518012231 has 4 divisors (see below), whose sum is σ = 565104264. Its totient is φ = 470920200.

The previous prime is 518012221. The next prime is 518012249. The reversal of 518012231 is 132210815.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 518012231 - 2⁶ = 518012167 is a prime.

It is a super-2 number, since 2×518012231² = 536673342931194722, 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 = 518012197 and 518012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518012221) 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, 23546000 + ... + 23546021.

It is an arithmetic number, because the mean of its divisors is an integer number (141276066).

Almost surely, 2^518012231 is an apocalyptic number.

518012231 is a deficient number, since it is larger than the sum of its proper divisors (47092033).

518012231 is a wasteful number, since it uses less digits than its factorization.

518012231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47092032.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 518012231 is about 22759.8820515397. The cubic root of 518012231 is about 803.1191928017.

The spelling of 518012231 in words is "five hundred eighteen million, twelve thousand, two hundred thirty-one".