347221813 has 2 divisors, whose sum is σ = 347221814. Its totient is φ = 347221812.

The previous prime is 347221807. The next prime is 347221871. The reversal of 347221813 is 318122743.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347188689 + 33124 = 18633^2 + 182^2 .

It is a cyclic number.

It is not a de Polignac number, because 347221813 - 2⁵ = 347221781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (347221883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173610906 + 173610907.

It is an arithmetic number, because the mean of its divisors is an integer number (173610907).

Almost surely, 2^347221813 is an apocalyptic number.

It is an amenable number.

347221813 is a deficient number, since it is larger than the sum of its proper divisors (1).

347221813 is an equidigital number, since it uses as much as digits as its factorization.

347221813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 347221813 is about 18633.8888319105. Note that the first 4 decimals coincide. The cubic root of 347221813 is about 702.8602782969.

The spelling of 347221813 in words is "three hundred forty-seven million, two hundred twenty-one thousand, eight hundred thirteen".