1216239433 has 2 divisors, whose sum is σ = 1216239434. Its totient is φ = 1216239432.

The previous prime is 1216239407. The next prime is 1216239473. The reversal of 1216239433 is 3349326121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1205270089 + 10969344 = 34717^2 + 3312^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216239433 is a prime.

It is a super-2 number, since 2×1216239433² = 2958476716768322978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1216239473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608119716 + 608119717.

It is an arithmetic number, because the mean of its divisors is an integer number (608119717).

Almost surely, 2^1216239433 is an apocalyptic number.

It is an amenable number.

1216239433 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216239433 is an equidigital number, since it uses as much as digits as its factorization.

1216239433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 34.

The square root of 1216239433 is about 34874.6244854335. The cubic root of 1216239433 is about 1067.4307100900.

The spelling of 1216239433 in words is "one billion, two hundred sixteen million, two hundred thirty-nine thousand, four hundred thirty-three".