3215707320691 has 2 divisors, whose sum is σ = 3215707320692. Its totient is φ = 3215707320690.

The previous prime is 3215707320689. The next prime is 3215707320713. The reversal of 3215707320691 is 1960237075123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3215707320691 - 2¹ = 3215707320689 is a prime.

Together with 3215707320689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3215707320671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1607853660345 + 1607853660346.

It is an arithmetic number, because the mean of its divisors is an integer number (1607853660346).

Almost surely, 2^{3215707320691} is an apocalyptic number.

3215707320691 is a deficient number, since it is larger than the sum of its proper divisors (1).

3215707320691 is an equidigital number, since it uses as much as digits as its factorization.

3215707320691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 476280, while the sum is 46.

The spelling of 3215707320691 in words is "three trillion, two hundred fifteen billion, seven hundred seven million, three hundred twenty thousand, six hundred ninety-one".