1216041109 has 2 divisors, whose sum is σ = 1216041110. Its totient is φ = 1216041108.

The previous prime is 1216041107. The next prime is 1216041121. The reversal of 1216041109 is 9011406121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621754225 + 594286884 = 24935^2 + 24378^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216041109 - 2¹ = 1216041107 is a prime.

Together with 1216041107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216041103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608020554 + 608020555.

It is an arithmetic number, because the mean of its divisors is an integer number (608020555).

Almost surely, 2^1216041109 is an apocalyptic number.

It is an amenable number.

1216041109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216041109 is an equidigital number, since it uses as much as digits as its factorization.

1216041109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1216041109 is about 34871.7809840564. The cubic root of 1216041109 is about 1067.3726873492.

The spelling of 1216041109 in words is "one billion, two hundred sixteen million, forty-one thousand, one hundred nine".