1645743443 has 2 divisors, whose sum is σ = 1645743444. Its totient is φ = 1645743442.

The previous prime is 1645743431. The next prime is 1645743479. The reversal of 1645743443 is 3443475461.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1645743443 - 2⁴ = 1645743427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645743443.

It is not a weakly prime, because it can be changed into another prime (1645743643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822871721 + 822871722.

It is an arithmetic number, because the mean of its divisors is an integer number (822871722).

Almost surely, 2^1645743443 is an apocalyptic number.

1645743443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645743443 is an equidigital number, since it uses as much as digits as its factorization.

1645743443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 41.

The square root of 1645743443 is about 40567.7635937699. The cubic root of 1645743443 is about 1180.6487486427.

The spelling of 1645743443 in words is "one billion, six hundred forty-five million, seven hundred forty-three thousand, four hundred forty-three".