1216542227 has 2 divisors, whose sum is σ = 1216542228. Its totient is φ = 1216542226.

The previous prime is 1216542211. The next prime is 1216542319. The reversal of 1216542227 is 7222456121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1216542227 - 2⁴ = 1216542211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216542193 and 1216542202.

It is not a weakly prime, because it can be changed into another prime (1216548227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608271113 + 608271114.

It is an arithmetic number, because the mean of its divisors is an integer number (608271114).

Almost surely, 2^1216542227 is an apocalyptic number.

1216542227 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216542227 is an equidigital number, since it uses as much as digits as its factorization.

1216542227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 32.

The square root of 1216542227 is about 34878.9653946329. The cubic root of 1216542227 is about 1067.5192849728.

Adding to 1216542227 its reverse (7222456121), we get a palindrome (8438998348).

The spelling of 1216542227 in words is "one billion, two hundred sixteen million, five hundred forty-two thousand, two hundred twenty-seven".