1643230613 has 4 divisors (see below), whose sum is σ = 1644547500. Its totient is φ = 1641913728.

The previous prime is 1643230579. The next prime is 1643230619. The reversal of 1643230613 is 3160323461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3160323461 = 3539 ⋅892999.

It can be written as a sum of positive squares in 2 ways, for example, as 572501329 + 1070729284 = 23927^2 + 32722^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643230613 - 2⁶ = 1643230549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643230619) 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 in 3 ways as a sum of consecutive naturals, for example, 656570 + ... + 659067.

It is an arithmetic number, because the mean of its divisors is an integer number (411136875).

Almost surely, 2^1643230613 is an apocalyptic number.

It is an amenable number.

1643230613 is a deficient number, since it is larger than the sum of its proper divisors (1316887).

1643230613 is a wasteful number, since it uses less digits than its factorization.

1643230613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316886.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 1643230613 is about 40536.7809896149. The cubic root of 1643230613 is about 1180.0475450057.

The spelling of 1643230613 in words is "one billion, six hundred forty-three million, two hundred thirty thousand, six hundred thirteen".