1216512433 has 2 divisors, whose sum is σ = 1216512434. Its totient is φ = 1216512432.

The previous prime is 1216512397. The next prime is 1216512457. The reversal of 1216512433 is 3342156121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1119036304 + 97476129 = 33452^2 + 9873^2 .

It is an emirp because it is prime and its reverse (3342156121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216512433 - 2²⁵ = 1182958001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216512533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608256216 + 608256217.

It is an arithmetic number, because the mean of its divisors is an integer number (608256217).

Almost surely, 2^1216512433 is an apocalyptic number.

It is an amenable number.

1216512433 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216512433 is an equidigital number, since it uses as much as digits as its factorization.

1216512433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 1216512433 is about 34878.5382864592. The cubic root of 1216512433 is about 1067.5105701283.

Adding to 1216512433 its reverse (3342156121), we get a palindrome (4558668554).

The spelling of 1216512433 in words is "one billion, two hundred sixteen million, five hundred twelve thousand, four hundred thirty-three".