3291217990891 has 2 divisors, whose sum is σ = 3291217990892. Its totient is φ = 3291217990890.

The previous prime is 3291217990847. The next prime is 3291217990909. The reversal of 3291217990891 is 1980997121923.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3291217990891 - 2¹⁷ = 3291217859819 is a prime.

It is not a weakly prime, because it can be changed into another prime (3291217990591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1645608995445 + 1645608995446.

It is an arithmetic number, because the mean of its divisors is an integer number (1645608995446).

Almost surely, 2^{3291217990891} is an apocalyptic number.

3291217990891 is a deficient number, since it is larger than the sum of its proper divisors (1).

3291217990891 is an equidigital number, since it uses as much as digits as its factorization.

3291217990891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4408992, while the sum is 61.

The spelling of 3291217990891 in words is "three trillion, two hundred ninety-one billion, two hundred seventeen million, nine hundred ninety thousand, eight hundred ninety-one".