531243403001 has 4 divisors (see below), whose sum is σ = 535121092212. Its totient is φ = 527365713792.

The previous prime is 531243402983. The next prime is 531243403037. The reversal of 531243403001 is 100304342135.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100304342135 = 5 ⋅20060868427.

It can be written as a sum of positive squares in 2 ways, for example, as 189312010000 + 341931393001 = 435100^2 + 584749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531243403001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531243403091) 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, 1938844400 + ... + 1938844673.

It is an arithmetic number, because the mean of its divisors is an integer number (133780273053).

Almost surely, 2^531243403001 is an apocalyptic number.

It is an amenable number.

531243403001 is a deficient number, since it is larger than the sum of its proper divisors (3877689211).

531243403001 is a wasteful number, since it uses less digits than its factorization.

531243403001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3877689210.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 531243403001 its reverse (100304342135), we get a palindrome (631547745136).

The spelling of 531243403001 in words is "five hundred thirty-one billion, two hundred forty-three million, four hundred three thousand, one".