531531997 has 2 divisors, whose sum is σ = 531531998. Its totient is φ = 531531996.

The previous prime is 531531991. The next prime is 531532009. The reversal of 531531997 is 799135135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 527666841 + 3865156 = 22971^2 + 1966^2 .

It is a cyclic number.

It is not a de Polignac number, because 531531997 - 2³ = 531531989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531531991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265765998 + 265765999.

It is an arithmetic number, because the mean of its divisors is an integer number (265765999).

Almost surely, 2^531531997 is an apocalyptic number.

It is an amenable number.

531531997 is a deficient number, since it is larger than the sum of its proper divisors (1).

531531997 is an equidigital number, since it uses as much as digits as its factorization.

531531997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127575, while the sum is 43.

The square root of 531531997 is about 23054.9777054761. The cubic root of 531531997 is about 810.0462286271.

The spelling of 531531997 in words is "five hundred thirty-one million, five hundred thirty-one thousand, nine hundred ninety-seven".