1643300243 has 4 divisors (see below), whose sum is σ = 1769707968. Its totient is φ = 1516892520.

The previous prime is 1643300221. The next prime is 1643300333. The reversal of 1643300243 is 3420033461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1643300243 - 2¹⁶ = 1643234707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1643300843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63203843 + ... + 63203868.

It is an arithmetic number, because the mean of its divisors is an integer number (442426992).

Almost surely, 2^1643300243 is an apocalyptic number.

1643300243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1643300243 is a deficient number, since it is larger than the sum of its proper divisors (126407725).

1643300243 is a wasteful number, since it uses less digits than its factorization.

1643300243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126407724.

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 1643300243 is about 40537.6398301628. The cubic root of 1643300243 is about 1180.0642124877.

The spelling of 1643300243 in words is "one billion, six hundred forty-three million, three hundred thousand, two hundred forty-three".