3218433749 has 4 divisors (see below), whose sum is σ = 3271195020. Its totient is φ = 3165672480.

The previous prime is 3218433721. The next prime is 3218433767. The reversal of 3218433749 is 9473348123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9473348123 = 23 ⋅411884701.

It can be written as a sum of positive squares in 2 ways, for example, as 508502500 + 2709931249 = 22550^2 + 52057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3218433749 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 (3218433649) 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, 26380544 + ... + 26380665.

It is an arithmetic number, because the mean of its divisors is an integer number (817798755).

Almost surely, 2^3218433749 is an apocalyptic number.

It is an amenable number.

3218433749 is a deficient number, since it is larger than the sum of its proper divisors (52761271).

3218433749 is an equidigital number, since it uses as much as digits as its factorization.

3218433749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52761270.

The product of its digits is 435456, while the sum is 44.

The square root of 3218433749 is about 56731.2413842673. The cubic root of 3218433749 is about 1476.4367880863.

The spelling of 3218433749 in words is "three billion, two hundred eighteen million, four hundred thirty-three thousand, seven hundred forty-nine".