1643092993 has 4 divisors (see below), whose sum is σ = 1739745540. Its totient is φ = 1546440448.

The previous prime is 1643092987. The next prime is 1643093009. The reversal of 1643092993 is 3992903461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3992903461 = 37199 ⋅107339.

It can be written as a sum of positive squares in 2 ways, for example, as 1458323344 + 184769649 = 38188^2 + 13593^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643092993 - 2¹³ = 1643084801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1643093993) 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, 48326248 + ... + 48326281.

It is an arithmetic number, because the mean of its divisors is an integer number (434936385).

Almost surely, 2^1643092993 is an apocalyptic number.

It is an amenable number.

1643092993 is a deficient number, since it is larger than the sum of its proper divisors (96652547).

1643092993 is an equidigital number, since it uses as much as digits as its factorization.

1643092993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96652546.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 1643092993 is about 40535.0834833234. The cubic root of 1643092993 is about 1180.0146012270.

The spelling of 1643092993 in words is "one billion, six hundred forty-three million, ninety-two thousand, nine hundred ninety-three".