3221131391 has 2 divisors, whose sum is σ = 3221131392. Its totient is φ = 3221131390.

The previous prime is 3221131367. The next prime is 3221131409. The reversal of 3221131391 is 1931311223.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3221131391 - 2¹⁸ = 3220869247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3221131391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3221131091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610565695 + 1610565696.

It is an arithmetic number, because the mean of its divisors is an integer number (1610565696).

Almost surely, 2^3221131391 is an apocalyptic number.

3221131391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3221131391 is an equidigital number, since it uses as much as digits as its factorization.

3221131391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 26.

The square root of 3221131391 is about 56755.0120341807. The cubic root of 3221131391 is about 1476.8491818071.

The spelling of 3221131391 in words is "three billion, two hundred twenty-one million, one hundred thirty-one thousand, three hundred ninety-one".