347271991721 has 2 divisors, whose sum is σ = 347271991722. Its totient is φ = 347271991720.

The previous prime is 347271991711. The next prime is 347271991753. The reversal of 347271991721 is 127199172743.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 279591367696 + 67680624025 = 528764^2 + 260155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-347271991721 is a prime.

It is not a weakly prime, because it can be changed into another prime (347271991711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173635995860 + 173635995861.

It is an arithmetic number, because the mean of its divisors is an integer number (173635995861).

Almost surely, 2^347271991721 is an apocalyptic number.

It is an amenable number.

347271991721 is a deficient number, since it is larger than the sum of its proper divisors (1).

347271991721 is an equidigital number, since it uses as much as digits as its factorization.

347271991721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 53.

The spelling of 347271991721 in words is "three hundred forty-seven billion, two hundred seventy-one million, nine hundred ninety-one thousand, seven hundred twenty-one".