1216107917 has 2 divisors, whose sum is σ = 1216107918. Its totient is φ = 1216107916.

The previous prime is 1216107913. The next prime is 1216107923. The reversal of 1216107917 is 7197016121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658486921 + 557620996 = 25661^2 + 23614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216107917 - 2² = 1216107913 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216107913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608053958 + 608053959.

It is an arithmetic number, because the mean of its divisors is an integer number (608053959).

Almost surely, 2^1216107917 is an apocalyptic number.

It is an amenable number.

1216107917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216107917 is an equidigital number, since it uses as much as digits as its factorization.

1216107917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 35.

The square root of 1216107917 is about 34872.7388801052. The cubic root of 1216107917 is about 1067.3922337632.

The spelling of 1216107917 in words is "one billion, two hundred sixteen million, one hundred seven thousand, nine hundred seventeen".