1716651221 has 2 divisors, whose sum is σ = 1716651222. Its totient is φ = 1716651220.

The previous prime is 1716651191. The next prime is 1716651227. The reversal of 1716651221 is 1221566171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1240800625 + 475850596 = 35225^2 + 21814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1716651221 - 2¹⁴ = 1716634837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1716651227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 858325610 + 858325611.

It is an arithmetic number, because the mean of its divisors is an integer number (858325611).

Almost surely, 2^1716651221 is an apocalyptic number.

It is an amenable number.

1716651221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1716651221 is an equidigital number, since it uses as much as digits as its factorization.

1716651221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 1716651221 is about 41432.4899203512. The cubic root of 1716651221 is about 1197.3671956663.

The spelling of 1716651221 in words is "one billion, seven hundred sixteen million, six hundred fifty-one thousand, two hundred twenty-one".