1216322351 has 2 divisors, whose sum is σ = 1216322352. Its totient is φ = 1216322350.

The previous prime is 1216322311. The next prime is 1216322357. The reversal of 1216322351 is 1532236121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216322351 - 2⁶ = 1216322287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216322351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216322357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608161175 + 608161176.

It is an arithmetic number, because the mean of its divisors is an integer number (608161176).

Almost surely, 2^1216322351 is an apocalyptic number.

1216322351 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216322351 is an equidigital number, since it uses as much as digits as its factorization.

1216322351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 1216322351 is about 34875.8132665032. The cubic root of 1216322351 is about 1067.4549671581.

Adding to 1216322351 its reverse (1532236121), we get a palindrome (2748558472).

The spelling of 1216322351 in words is "one billion, two hundred sixteen million, three hundred twenty-two thousand, three hundred fifty-one".