3216139391 has 2 divisors, whose sum is σ = 3216139392. Its totient is φ = 3216139390.

The previous prime is 3216139379. The next prime is 3216139393. The reversal of 3216139391 is 1939316123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3216139391 - 2¹⁴ = 3216123007 is a prime.

Together with 3216139393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3216139393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1608069695 + 1608069696.

It is an arithmetic number, because the mean of its divisors is an integer number (1608069696).

Almost surely, 2^3216139391 is an apocalyptic number.

3216139391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3216139391 is an equidigital number, since it uses as much as digits as its factorization.

3216139391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 38.

The square root of 3216139391 is about 56711.0164870989. The cubic root of 3216139391 is about 1476.0858637865.

The spelling of 3216139391 in words is "three billion, two hundred sixteen million, one hundred thirty-nine thousand, three hundred ninety-one".