1431221899 has 2 divisors, whose sum is σ = 1431221900. Its totient is φ = 1431221898.

The previous prime is 1431221881. The next prime is 1431221903. The reversal of 1431221899 is 9981221341.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1431221899 - 2⁹ = 1431221387 is a prime.

It is a super-2 number, since 2×1431221899² = 4096792248354332402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1431221849) 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, 715610949 + 715610950.

It is an arithmetic number, because the mean of its divisors is an integer number (715610950).

Almost surely, 2^1431221899 is an apocalyptic number.

1431221899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431221899 is an equidigital number, since it uses as much as digits as its factorization.

1431221899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 1431221899 is about 37831.4934809611. The cubic root of 1431221899 is about 1126.9439703595.

The spelling of 1431221899 in words is "one billion, four hundred thirty-one million, two hundred twenty-one thousand, eight hundred ninety-nine".