1431544321 has 2 divisors, whose sum is σ = 1431544322. Its totient is φ = 1431544320.

The previous prime is 1431544307. The next prime is 1431544337. The reversal of 1431544321 is 1234451341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1375593921 + 55950400 = 37089^2 + 7480^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431544321 - 2⁷ = 1431544193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1431544321.

It is not a weakly prime, because it can be changed into another prime (1431544351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715772160 + 715772161.

It is an arithmetic number, because the mean of its divisors is an integer number (715772161).

Almost surely, 2^1431544321 is an apocalyptic number.

It is an amenable number.

1431544321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431544321 is an equidigital number, since it uses as much as digits as its factorization.

1431544321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

The square root of 1431544321 is about 37835.7545319239. The cubic root of 1431544321 is about 1127.0285890217.

Adding to 1431544321 its reverse (1234451341), we get a palindrome (2665995662).

The spelling of 1431544321 in words is "one billion, four hundred thirty-one million, five hundred forty-four thousand, three hundred twenty-one".