1431221669 has 2 divisors, whose sum is σ = 1431221670. Its totient is φ = 1431221668.

The previous prime is 1431221633. The next prime is 1431221677. The reversal of 1431221669 is 9661221341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 848964769 + 582256900 = 29137^2 + 24130^2 .

It is an emirp because it is prime and its reverse (9661221341) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1431221669 is a prime.

It is a super-2 number, since 2×1431221669² = 4096790931630291122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1431221969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715610834 + 715610835.

It is an arithmetic number, because the mean of its divisors is an integer number (715610835).

Almost surely, 2^1431221669 is an apocalyptic number.

It is an amenable number.

1431221669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431221669 is an equidigital number, since it uses as much as digits as its factorization.

1431221669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 1431221669 is about 37831.4904411655. The cubic root of 1431221669 is about 1126.9439099921.

The spelling of 1431221669 in words is "one billion, four hundred thirty-one million, two hundred twenty-one thousand, six hundred sixty-nine".