1611663217 has 2 divisors, whose sum is σ = 1611663218. Its totient is φ = 1611663216.

The previous prime is 1611663173. The next prime is 1611663259. The reversal of 1611663217 is 7123661161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1462603536 + 149059681 = 38244^2 + 12209^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611663217 - 2⁷ = 1611663089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1611663017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805831608 + 805831609.

It is an arithmetic number, because the mean of its divisors is an integer number (805831609).

Almost surely, 2^1611663217 is an apocalyptic number.

It is an amenable number.

1611663217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611663217 is an equidigital number, since it uses as much as digits as its factorization.

1611663217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 1611663217 is about 40145.5254916410. The cubic root of 1611663217 is about 1172.4421720790.

The spelling of 1611663217 in words is "one billion, six hundred eleven million, six hundred sixty-three thousand, two hundred seventeen".