431242321 has 2 divisors, whose sum is σ = 431242322. Its totient is φ = 431242320.

The previous prime is 431242307. The next prime is 431242391. The reversal of 431242321 is 123242134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 357625921 + 73616400 = 18911^2 + 8580^2 .

It is a cyclic number.

It is not a de Polignac number, because 431242321 - 2⁷ = 431242193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 431242292 and 431242301.

It is not a weakly prime, because it can be changed into another prime (431242391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215621160 + 215621161.

It is an arithmetic number, because the mean of its divisors is an integer number (215621161).

Almost surely, 2^431242321 is an apocalyptic number.

It is an amenable number.

431242321 is a deficient number, since it is larger than the sum of its proper divisors (1).

431242321 is an equidigital number, since it uses as much as digits as its factorization.

431242321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 22.

The square root of 431242321 is about 20766.3747678790. The cubic root of 431242321 is about 755.5104195844.

Adding to 431242321 its reverse (123242134), we get a palindrome (554484455).

The spelling of 431242321 in words is "four hundred thirty-one million, two hundred forty-two thousand, three hundred twenty-one".