531680813 has 2 divisors, whose sum is σ = 531680814. Its totient is φ = 531680812.

The previous prime is 531680791. The next prime is 531680833. The reversal of 531680813 is 318086135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 527023849 + 4656964 = 22957^2 + 2158^2 .

It is a cyclic number.

It is not a de Polignac number, because 531680813 - 2¹⁴ = 531664429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531680833) 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, 265840406 + 265840407.

It is an arithmetic number, because the mean of its divisors is an integer number (265840407).

Almost surely, 2^531680813 is an apocalyptic number.

It is an amenable number.

531680813 is a deficient number, since it is larger than the sum of its proper divisors (1).

531680813 is an equidigital number, since it uses as much as digits as its factorization.

531680813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 531680813 is about 23058.2048954380. The cubic root of 531680813 is about 810.1218193045.

The spelling of 531680813 in words is "five hundred thirty-one million, six hundred eighty thousand, eight hundred thirteen".