531140209 has 2 divisors, whose sum is σ = 531140210. Its totient is φ = 531140208.

The previous prime is 531140167. The next prime is 531140221. The reversal of 531140209 is 902041135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381616225 + 149523984 = 19535^2 + 12228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531140209 is a prime.

It is not a weakly prime, because it can be changed into another prime (531141209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265570104 + 265570105.

It is an arithmetic number, because the mean of its divisors is an integer number (265570105).

Almost surely, 2^531140209 is an apocalyptic number.

It is an amenable number.

531140209 is a deficient number, since it is larger than the sum of its proper divisors (1).

531140209 is an equidigital number, since it uses as much as digits as its factorization.

531140209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 531140209 is about 23046.4793189763. The cubic root of 531140209 is about 809.8471534999.

The spelling of 531140209 in words is "five hundred thirty-one million, one hundred forty thousand, two hundred nine".