3973221191 has 4 divisors (see below), whose sum is σ = 3987991800. Its totient is φ = 3958450584.

The previous prime is 3973221167. The next prime is 3973221211. The reversal of 3973221191 is 1911223793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1911223793 = 17 ⋅112424929.

It is a cyclic number.

It is not a de Polignac number, because 3973221191 - 2⁶ = 3973221127 is a prime.

It is a super-2 number, since 2×3973221191² = 31572973265222916962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3973221121) 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, 7384901 + ... + 7385438.

It is an arithmetic number, because the mean of its divisors is an integer number (996997950).

Almost surely, 2^3973221191 is an apocalyptic number.

3973221191 is a deficient number, since it is larger than the sum of its proper divisors (14770609).

3973221191 is a wasteful number, since it uses less digits than its factorization.

3973221191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14770608.

The product of its digits is 20412, while the sum is 38.

The square root of 3973221191 is about 63033.4926130545. The cubic root of 3973221191 is about 1583.8507248827.

The spelling of 3973221191 in words is "three billion, nine hundred seventy-three million, two hundred twenty-one thousand, one hundred ninety-one".