515716231 has 2 divisors, whose sum is σ = 515716232. Its totient is φ = 515716230.

The previous prime is 515716153. The next prime is 515716237. The reversal of 515716231 is 132617515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 515716231 - 2⁹ = 515715719 is a prime.

It is a super-2 number, since 2×515716231² = 531926461833690722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 515716193 and 515716202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515716237) 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 as a sum of consecutive naturals, namely, 257858115 + 257858116.

It is an arithmetic number, because the mean of its divisors is an integer number (257858116).

Almost surely, 2^515716231 is an apocalyptic number.

515716231 is a deficient number, since it is larger than the sum of its proper divisors (1).

515716231 is an equidigital number, since it uses as much as digits as its factorization.

515716231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 31.

The square root of 515716231 is about 22709.3864073867. The cubic root of 515716231 is about 801.9308728921.

The spelling of 515716231 in words is "five hundred fifteen million, seven hundred sixteen thousand, two hundred thirty-one".