1691228317 has 2 divisors, whose sum is σ = 1691228318. Its totient is φ = 1691228316.

The previous prime is 1691228299. The next prime is 1691228321. The reversal of 1691228317 is 7138221961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1138320121 + 552908196 = 33739^2 + 23514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1691228317 - 2¹⁵ = 1691195549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1691228317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691228377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845614158 + 845614159.

It is an arithmetic number, because the mean of its divisors is an integer number (845614159).

Almost surely, 2^1691228317 is an apocalyptic number.

It is an amenable number.

1691228317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691228317 is an equidigital number, since it uses as much as digits as its factorization.

1691228317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 1691228317 is about 41124.5464047933. The cubic root of 1691228317 is about 1191.4269343194.

The spelling of 1691228317 in words is "one billion, six hundred ninety-one million, two hundred twenty-eight thousand, three hundred seventeen".