531640859 has 2 divisors, whose sum is σ = 531640860. Its totient is φ = 531640858.

The previous prime is 531640819. The next prime is 531640897. The reversal of 531640859 is 958046135.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 531640859 - 2¹⁶ = 531575323 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (531640819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265820429 + 265820430.

It is an arithmetic number, because the mean of its divisors is an integer number (265820430).

Almost surely, 2^531640859 is an apocalyptic number.

531640859 is a deficient number, since it is larger than the sum of its proper divisors (1).

531640859 is an equidigital number, since it uses as much as digits as its factorization.

531640859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 531640859 is about 23057.3385064278. The cubic root of 531640859 is about 810.1015261655.

The spelling of 531640859 in words is "five hundred thirty-one million, six hundred forty thousand, eight hundred fifty-nine".