531640897 has 2 divisors, whose sum is σ = 531640898. Its totient is φ = 531640896.

The previous prime is 531640859. The next prime is 531640927. The reversal of 531640897 is 798046135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 489117456 + 42523441 = 22116^2 + 6521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531640897 is a prime.

It is not a weakly prime, because it can be changed into another prime (531640397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265820448 + 265820449.

It is an arithmetic number, because the mean of its divisors is an integer number (265820449).

Almost surely, 2^531640897 is an apocalyptic number.

It is an amenable number.

531640897 is a deficient number, since it is larger than the sum of its proper divisors (1).

531640897 is an equidigital number, since it uses as much as digits as its factorization.

531640897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 531640897 is about 23057.3393304605. The cubic root of 531640897 is about 810.1015454667.

The spelling of 531640897 in words is "five hundred thirty-one million, six hundred forty thousand, eight hundred ninety-seven".