1243453643 has 2 divisors, whose sum is σ = 1243453644. Its totient is φ = 1243453642.

The previous prime is 1243453597. The next prime is 1243453649. The reversal of 1243453643 is 3463543421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1243453643 - 2¹⁰ = 1243452619 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243453649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621726821 + 621726822.

It is an arithmetic number, because the mean of its divisors is an integer number (621726822).

Almost surely, 2^1243453643 is an apocalyptic number.

1243453643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243453643 is an equidigital number, since it uses as much as digits as its factorization.

1243453643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 35.

The square root of 1243453643 is about 35262.6380607010. The cubic root of 1243453643 is about 1075.3335595149. Note that the first 3 decimals are identical.

The spelling of 1243453643 in words is "one billion, two hundred forty-three million, four hundred fifty-three thousand, six hundred forty-three".