1216675121 has 2 divisors, whose sum is σ = 1216675122. Its totient is φ = 1216675120.

The previous prime is 1216675093. The next prime is 1216675151. The reversal of 1216675121 is 1215766121.

1216675121 = 24664² + 24665².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 608362225 + 608312896 = 24665^2 + 24664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216675121 is a prime.

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 (1216675151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608337560 + 608337561.

It is an arithmetic number, because the mean of its divisors is an integer number (608337561).

Almost surely, 2^1216675121 is an apocalyptic number.

1216675121 is the 24665-th centered square number.

It is an amenable number.

1216675121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216675121 is an equidigital number, since it uses as much as digits as its factorization.

1216675121 is an evil number, because the sum of its binary digits is even.

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

The square root of 1216675121 is about 34880.8704163185. The cubic root of 1216675121 is about 1067.5581551792.

The spelling of 1216675121 in words is "one billion, two hundred sixteen million, six hundred seventy-five thousand, one hundred twenty-one".