515516231 has 4 divisors (see below), whose sum is σ = 516747000. Its totient is φ = 514285464.

The previous prime is 515516201. The next prime is 515516233. The reversal of 515516231 is 132615515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132615515 = 5 ⋅26523103.

It is a cyclic number.

It is not a de Polignac number, because 515516231 - 2¹⁰ = 515515207 is a prime.

It is a super-2 number, since 2×515516231² = 531513968848890722, 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 = 515516194 and 515516203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515516233) 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, 614756 + ... + 615593.

It is an arithmetic number, because the mean of its divisors is an integer number (129186750).

Almost surely, 2^515516231 is an apocalyptic number.

515516231 is a deficient number, since it is larger than the sum of its proper divisors (1230769).

515516231 is a wasteful number, since it uses less digits than its factorization.

515516231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230768.

The product of its digits is 4500, while the sum is 29.

The square root of 515516231 is about 22704.9825148578. The cubic root of 515516231 is about 801.8271938386.

The spelling of 515516231 in words is "five hundred fifteen million, five hundred sixteen thousand, two hundred thirty-one".