1216538227 has 2 divisors, whose sum is σ = 1216538228. Its totient is φ = 1216538226.

The previous prime is 1216538131. The next prime is 1216538263. The reversal of 1216538227 is 7228356121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216538227 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216538527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608269113 + 608269114.

It is an arithmetic number, because the mean of its divisors is an integer number (608269114).

Almost surely, 2^1216538227 is an apocalyptic number.

1216538227 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216538227 is an equidigital number, since it uses as much as digits as its factorization.

1216538227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 1216538227 is about 34878.9080534354. The cubic root of 1216538227 is about 1067.5181149677.

The spelling of 1216538227 in words is "one billion, two hundred sixteen million, five hundred thirty-eight thousand, two hundred twenty-seven".