531555240109 has 4 divisors (see below), whose sum is σ = 541584584316. Its totient is φ = 521525895904.

The previous prime is 531555240107. The next prime is 531555240121. The reversal of 531555240109 is 901042555135.

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 364665015625 + 166890224484 = 603875^2 + 408522^2 .

It is a cyclic number.

It is not a de Polignac number, because 531555240109 - 2¹ = 531555240107 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531555240107) 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, 5014672024 + ... + 5014672129.

It is an arithmetic number, because the mean of its divisors is an integer number (135396146079).

Almost surely, 2^531555240109 is an apocalyptic number.

It is an amenable number.

531555240109 is a deficient number, since it is larger than the sum of its proper divisors (10029344207).

531555240109 is a wasteful number, since it uses less digits than its factorization.

531555240109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10029344206.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 531555240109 in words is "five hundred thirty-one billion, five hundred fifty-five million, two hundred forty thousand, one hundred nine".