431111321 has 2 divisors, whose sum is σ = 431111322. Its totient is φ = 431111320.

The previous prime is 431111243. The next prime is 431111357. The reversal of 431111321 is 123111134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 429318400 + 1792921 = 20720^2 + 1339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431111321 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 431111321.

It is not a weakly prime, because it can be changed into another prime (431111371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215555660 + 215555661.

It is an arithmetic number, because the mean of its divisors is an integer number (215555661).

Almost surely, 2^431111321 is an apocalyptic number.

It is an amenable number.

431111321 is a deficient number, since it is larger than the sum of its proper divisors (1).

431111321 is an equidigital number, since it uses as much as digits as its factorization.

431111321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 17.

The square root of 431111321 is about 20763.2203908739. The cubic root of 431111321 is about 755.4339104823.

Adding to 431111321 its reverse (123111134), we get a palindrome (554222455).

It can be divided in two parts, 4311113 and 21, that added together give a palindrome (4311134).

The spelling of 431111321 in words is "four hundred thirty-one million, one hundred eleven thousand, three hundred twenty-one".