531740809 has 4 divisors (see below), whose sum is σ = 532144660. Its totient is φ = 531336960.

The previous prime is 531740779. The next prime is 531740813. The reversal of 531740809 is 908047135.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 476461584 + 55279225 = 21828^2 + 7435^2 .

It is a cyclic number.

It is not a de Polignac number, because 531740809 - 2⁵ = 531740777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531740819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199944 + ... + 202585.

It is an arithmetic number, because the mean of its divisors is an integer number (133036165).

Almost surely, 2^531740809 is an apocalyptic number.

It is an amenable number.

531740809 is a deficient number, since it is larger than the sum of its proper divisors (403851).

531740809 is a wasteful number, since it uses less digits than its factorization.

531740809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403850.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 531740809 is about 23059.5058273156. The cubic root of 531740809 is about 810.1522901180.

The spelling of 531740809 in words is "five hundred thirty-one million, seven hundred forty thousand, eight hundred nine".