3973321851 has 4 divisors (see below), whose sum is σ = 5297762472. Its totient is φ = 2648881232.

The previous prime is 3973321841. The next prime is 3973321853. The reversal of 3973321851 is 1581233793.

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

It is a cyclic number.

It is not a de Polignac number, because 3973321851 - 2¹¹ = 3973319803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3973321853) 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, 662220306 + ... + 662220311.

It is an arithmetic number, because the mean of its divisors is an integer number (1324440618).

Almost surely, 2^3973321851 is an apocalyptic number.

3973321851 is a deficient number, since it is larger than the sum of its proper divisors (1324440621).

3973321851 is a wasteful number, since it uses less digits than its factorization.

3973321851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324440620.

The product of its digits is 136080, while the sum is 42.

The square root of 3973321851 is about 63034.2910723996. The cubic root of 3973321851 is about 1583.8641001820.

The spelling of 3973321851 in words is "three billion, nine hundred seventy-three million, three hundred twenty-one thousand, eight hundred fifty-one".