431231213 has 12 divisors (see below), whose sum is σ = 502032060. Its totient is φ = 369335232.

The previous prime is 431231183. The next prime is 431231243. The reversal of 431231213 is 312132134.

It is an interprime number because it is at equal distance from previous prime (431231183) and next prime (431231243).

It can be written as a sum of positive squares in 2 ways, for example, as 221473924 + 209757289 = 14882^2 + 14483^2 .

It is not a de Polignac number, because 431231213 - 2¹⁶ = 431165677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431231243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79145 + ... + 84417.

It is an arithmetic number, because the mean of its divisors is an integer number (41836005).

Almost surely, 2^431231213 is an apocalyptic number.

It is an amenable number.

431231213 is a deficient number, since it is larger than the sum of its proper divisors (70800847).

431231213 is a wasteful number, since it uses less digits than its factorization.

431231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6956 (or 6949 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 431231213 is about 20766.1073145643. The cubic root of 431231213 is about 755.5039326810.

Adding to 431231213 its reverse (312132134), we get a palindrome (743363347).

The spelling of 431231213 in words is "four hundred thirty-one million, two hundred thirty-one thousand, two hundred thirteen".