1216466437 has 2 divisors, whose sum is σ = 1216466438. Its totient is φ = 1216466436.

The previous prime is 1216466371. The next prime is 1216466473. The reversal of 1216466437 is 7346646121.

Together with next prime (1216466473) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 758121156 + 458345281 = 27534^2 + 21409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216466437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216466437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216466497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608233218 + 608233219.

It is an arithmetic number, because the mean of its divisors is an integer number (608233219).

Almost surely, 2^1216466437 is an apocalyptic number.

It is an amenable number.

1216466437 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216466437 is an equidigital number, since it uses as much as digits as its factorization.

1216466437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 1216466437 is about 34877.8789062638. The cubic root of 1216466437 is about 1067.4971158652.

The spelling of 1216466437 in words is "one billion, two hundred sixteen million, four hundred sixty-six thousand, four hundred thirty-seven".