431545321213 has 4 divisors (see below), whose sum is σ = 432506447100. Its totient is φ = 430584195328.

The previous prime is 431545321187. The next prime is 431545321247. The reversal of 431545321213 is 312123545134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312123545134 = 2 ⋅156061772567.

It can be written as a sum of positive squares in 2 ways, for example, as 192880829124 + 238664492089 = 439182^2 + 488533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431545321213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431545321913) 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, 480562270 + ... + 480563167.

It is an arithmetic number, because the mean of its divisors is an integer number (108126611775).

Almost surely, 2^431545321213 is an apocalyptic number.

It is an amenable number.

431545321213 is a deficient number, since it is larger than the sum of its proper divisors (961125887).

431545321213 is an equidigital number, since it uses as much as digits as its factorization.

431545321213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961125886.

The product of its digits is 43200, while the sum is 34.

Adding to 431545321213 its reverse (312123545134), we get a palindrome (743668866347).

The spelling of 431545321213 in words is "four hundred thirty-one billion, five hundred forty-five million, three hundred twenty-one thousand, two hundred thirteen".