531661597 has 2 divisors, whose sum is σ = 531661598. Its totient is φ = 531661596.

The previous prime is 531661541. The next prime is 531661607. The reversal of 531661597 is 795166135.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273770116 + 257891481 = 16546^2 + 16059^2 .

It is a cyclic number.

It is not a de Polignac number, because 531661597 - 2¹⁵ = 531628829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531664597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265830798 + 265830799.

It is an arithmetic number, because the mean of its divisors is an integer number (265830799).

Almost surely, 2^531661597 is an apocalyptic number.

It is an amenable number.

531661597 is a deficient number, since it is larger than the sum of its proper divisors (1).

531661597 is an equidigital number, since it uses as much as digits as its factorization.

531661597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 170100, while the sum is 43.

The square root of 531661597 is about 23057.7882070245. The cubic root of 531661597 is about 810.1120593834.

The spelling of 531661597 in words is "five hundred thirty-one million, six hundred sixty-one thousand, five hundred ninety-seven".