515866231 has 2 divisors, whose sum is σ = 515866232. Its totient is φ = 515866230.

The previous prime is 515866201. The next prime is 515866259. The reversal of 515866231 is 132668515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 515866231 - 2⁵ = 515866199 is a prime.

It is a super-2 number, since 2×515866231² = 532235936572290722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515866201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257933115 + 257933116.

It is an arithmetic number, because the mean of its divisors is an integer number (257933116).

Almost surely, 2^515866231 is an apocalyptic number.

515866231 is a deficient number, since it is larger than the sum of its proper divisors (1).

515866231 is an equidigital number, since it uses as much as digits as its factorization.

515866231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 37.

The square root of 515866231 is about 22712.6887664142. The cubic root of 515866231 is about 802.0086145927.

The spelling of 515866231 in words is "five hundred fifteen million, eight hundred sixty-six thousand, two hundred thirty-one".