515235231 has 12 divisors (see below), whose sum is σ = 850547152. Its totient is φ = 294420096.

The previous prime is 515235209. The next prime is 515235289. The reversal of 515235231 is 132532515.

It is a happy number.

It is not a de Polignac number, because 515235231 - 2¹⁰ = 515234207 is a prime.

It is a super-2 number, since 2×515235231² = 530934686527246722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 515235195 and 515235204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515231231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4089106 + ... + 4089231.

Almost surely, 2^515235231 is an apocalyptic number.

515235231 is a deficient number, since it is larger than the sum of its proper divisors (335311921).

515235231 is a wasteful number, since it uses less digits than its factorization.

515235231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8178350 (or 8178347 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 515235231 is about 22698.7936023041. The cubic root of 515235231 is about 801.6814794533.

Adding to 515235231 its reverse (132532515), we get a palindrome (647767746).

The spelling of 515235231 in words is "five hundred fifteen million, two hundred thirty-five thousand, two hundred thirty-one".