1216676161 has 2 divisors, whose sum is σ = 1216676162. Its totient is φ = 1216676160.

The previous prime is 1216676159. The next prime is 1216676183. The reversal of 1216676161 is 1616766121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1094352561 + 122323600 = 33081^2 + 11060^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216676161 - 2¹ = 1216676159 is a prime.

Together with 1216676159, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1216676161.

It is not a weakly prime, because it can be changed into another prime (1216676101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608338080 + 608338081.

It is an arithmetic number, because the mean of its divisors is an integer number (608338081).

Almost surely, 2^1216676161 is an apocalyptic number.

It is an amenable number.

1216676161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216676161 is an equidigital number, since it uses as much as digits as its factorization.

1216676161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 1216676161 is about 34880.8853242001. The cubic root of 1216676161 is about 1067.5584593580.

The spelling of 1216676161 in words is "one billion, two hundred sixteen million, six hundred seventy-six thousand, one hundred sixty-one".