1216441673 has 2 divisors, whose sum is σ = 1216441674. Its totient is φ = 1216441672.

The previous prime is 1216441661. The next prime is 1216441679. The reversal of 1216441673 is 3761446121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 979189264 + 237252409 = 31292^2 + 15403^2 .

It is an emirp because it is prime and its reverse (3761446121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216441673 - 2¹⁴ = 1216425289 is a prime.

It is a super-2 number, since 2×1216441673² = 2959460687622077858, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1216441679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608220836 + 608220837.

It is an arithmetic number, because the mean of its divisors is an integer number (608220837).

Almost surely, 2^1216441673 is an apocalyptic number.

It is an amenable number.

1216441673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216441673 is an equidigital number, since it uses as much as digits as its factorization.

1216441673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 1216441673 is about 34877.5238943363. The cubic root of 1216441673 is about 1067.4898720215.

Adding to 1216441673 its reverse (3761446121), we get a palindrome (4977887794).

The spelling of 1216441673 in words is "one billion, two hundred sixteen million, four hundred forty-one thousand, six hundred seventy-three".