1443420991 has 2 divisors, whose sum is σ = 1443420992. Its totient is φ = 1443420990.

The previous prime is 1443420971. The next prime is 1443421079. The reversal of 1443420991 is 1990243441.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1443420991 - 2⁷ = 1443420863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1443420991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1443420941) 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, 721710495 + 721710496.

It is an arithmetic number, because the mean of its divisors is an integer number (721710496).

Almost surely, 2^1443420991 is an apocalyptic number.

1443420991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1443420991 is an equidigital number, since it uses as much as digits as its factorization.

1443420991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 1443420991 is about 37992.3806966607. The cubic root of 1443420991 is about 1130.1367707164.

The spelling of 1443420991 in words is "one billion, four hundred forty-three million, four hundred twenty thousand, nine hundred ninety-one".