1431406321 has 2 divisors, whose sum is σ = 1431406322. Its totient is φ = 1431406320.

The previous prime is 1431406271. The next prime is 1431406337. The reversal of 1431406321 is 1236041341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1147854400 + 283551921 = 33880^2 + 16839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431406321 - 2²¹ = 1429309169 is a prime.

It is not a weakly prime, because it can be changed into another prime (1431406381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715703160 + 715703161.

It is an arithmetic number, because the mean of its divisors is an integer number (715703161).

Almost surely, 2^1431406321 is an apocalyptic number.

It is an amenable number.

1431406321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431406321 is an equidigital number, since it uses as much as digits as its factorization.

1431406321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1431406321 is about 37833.9308161338. The cubic root of 1431406321 is about 1126.9923729016.

Adding to 1431406321 its reverse (1236041341), we get a palindrome (2667447662).

The spelling of 1431406321 in words is "one billion, four hundred thirty-one million, four hundred six thousand, three hundred twenty-one".