347220661 has 2 divisors, whose sum is σ = 347220662. Its totient is φ = 347220660.

The previous prime is 347220607. The next prime is 347220701. The reversal of 347220661 is 166022743.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 328298161 + 18922500 = 18119^2 + 4350^2 .

It is a cyclic number.

It is not a de Polignac number, because 347220661 - 2⁹ = 347220149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (347220361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173610330 + 173610331.

It is an arithmetic number, because the mean of its divisors is an integer number (173610331).

Almost surely, 2^347220661 is an apocalyptic number.

It is an amenable number.

347220661 is a deficient number, since it is larger than the sum of its proper divisors (1).

347220661 is an equidigital number, since it uses as much as digits as its factorization.

347220661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 347220661 is about 18633.8579204630. The cubic root of 347220661 is about 702.8595009879.

The spelling of 347220661 in words is "three hundred forty-seven million, two hundred twenty thousand, six hundred sixty-one".