3941319721 has 4 divisors (see below), whose sum is σ = 4112681472. Its totient is φ = 3769957972.

The previous prime is 3941319677. The next prime is 3941319727. The reversal of 3941319721 is 1279131493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3941319721 - 2¹¹ = 3941317673 is a prime.

It is a super-2 number, since 2×3941319721² = 31068002286287035682, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3941319727) 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, 85680841 + ... + 85680886.

It is an arithmetic number, because the mean of its divisors is an integer number (1028170368).

Almost surely, 2^3941319721 is an apocalyptic number.

It is an amenable number.

3941319721 is a deficient number, since it is larger than the sum of its proper divisors (171361751).

3941319721 is a wasteful number, since it uses less digits than its factorization.

3941319721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171361750.

The product of its digits is 40824, while the sum is 40.

The square root of 3941319721 is about 62779.9308776300. The cubic root of 3941319721 is about 1579.6003530420.

The spelling of 3941319721 in words is "three billion, nine hundred forty-one million, three hundred nineteen thousand, seven hundred twenty-one".