1216732969 has 2 divisors, whose sum is σ = 1216732970. Its totient is φ = 1216732968.

The previous prime is 1216732967. The next prime is 1216732991. The reversal of 1216732969 is 9692376121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1210204944 + 6528025 = 34788^2 + 2555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216732969 - 2¹ = 1216732967 is a prime.

It is a super-2 number, since 2×1216732969² = 2960878235703109922, which contains 22 as substring.

Together with 1216732967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1216732967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608366484 + 608366485.

It is an arithmetic number, because the mean of its divisors is an integer number (608366485).

Almost surely, 2^1216732969 is an apocalyptic number.

It is an amenable number.

1216732969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216732969 is an equidigital number, since it uses as much as digits as its factorization.

1216732969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 46.

The square root of 1216732969 is about 34881.6996288885. The cubic root of 1216732969 is about 1067.5750742741.

The spelling of 1216732969 in words is "one billion, two hundred sixteen million, seven hundred thirty-two thousand, nine hundred sixty-nine".