1216231427 has 2 divisors, whose sum is σ = 1216231428. Its totient is φ = 1216231426.

The previous prime is 1216231417. The next prime is 1216231433. The reversal of 1216231427 is 7241326121.

It is a strong prime.

It is an emirp because it is prime and its reverse (7241326121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216231427 - 2⁴ = 1216231411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216231427.

It is not a weakly prime, because it can be changed into another prime (1216231417) 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, 608115713 + 608115714.

It is an arithmetic number, because the mean of its divisors is an integer number (608115714).

Almost surely, 2^1216231427 is an apocalyptic number.

1216231427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216231427 is an equidigital number, since it uses as much as digits as its factorization.

1216231427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 29.

The square root of 1216231427 is about 34874.5097026467. The cubic root of 1216231427 is about 1067.4283679335.

Adding to 1216231427 its reverse (7241326121), we get a palindrome (8457557548).

The spelling of 1216231427 in words is "one billion, two hundred sixteen million, two hundred thirty-one thousand, four hundred twenty-seven".