3217431994391 has 2 divisors, whose sum is σ = 3217431994392. Its totient is φ = 3217431994390.

The previous prime is 3217431994307. The next prime is 3217431994397. The reversal of 3217431994391 is 1934991347123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3217431994391 - 2¹⁰ = 3217431993367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3217431994397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1608715997195 + 1608715997196.

It is an arithmetic number, because the mean of its divisors is an integer number (1608715997196).

Almost surely, 2^{3217431994391} is an apocalyptic number.

3217431994391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3217431994391 is an equidigital number, since it uses as much as digits as its factorization.

3217431994391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 56.

The spelling of 3217431994391 in words is "three trillion, two hundred seventeen billion, four hundred thirty-one million, nine hundred ninety-four thousand, three hundred ninety-one".