531242709 has 4 divisors (see below), whose sum is σ = 708323616. Its totient is φ = 354161804.

The previous prime is 531242687. The next prime is 531242711. The reversal of 531242709 is 907242135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 531242709 - 2⁷ = 531242581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 531242709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531242759) 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, 88540449 + ... + 88540454.

It is an arithmetic number, because the mean of its divisors is an integer number (177080904).

Almost surely, 2^531242709 is an apocalyptic number.

It is an amenable number.

531242709 is a deficient number, since it is larger than the sum of its proper divisors (177080907).

531242709 is a wasteful number, since it uses less digits than its factorization.

531242709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177080906.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 531242709 is about 23048.7029786927. The cubic root of 531242709 is about 809.8992452029.

The spelling of 531242709 in words is "five hundred thirty-one million, two hundred forty-two thousand, seven hundred nine".