1216091147 has 2 divisors, whose sum is σ = 1216091148. Its totient is φ = 1216091146.

The previous prime is 1216091137. The next prime is 1216091153. The reversal of 1216091147 is 7411906121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216091147 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216091117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608045573 + 608045574.

It is an arithmetic number, because the mean of its divisors is an integer number (608045574).

Almost surely, 2^1216091147 is an apocalyptic number.

1216091147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216091147 is an equidigital number, since it uses as much as digits as its factorization.

1216091147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 1216091147 is about 34872.4984335794. The cubic root of 1216091147 is about 1067.3873273318.

Adding to 1216091147 its reverse (7411906121), we get a palindrome (8627997268).

The spelling of 1216091147 in words is "one billion, two hundred sixteen million, ninety-one thousand, one hundred forty-seven".