1216726307 has 2 divisors, whose sum is σ = 1216726308. Its totient is φ = 1216726306.

The previous prime is 1216726283. The next prime is 1216726309. The reversal of 1216726307 is 7036276121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216726307 - 2²⁰ = 1215677731 is a prime.

It is a super-2 number, since 2×1216726307² = 2960845812291716498, which contains 22 as substring.

Together with 1216726309, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1216726309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608363153 + 608363154.

It is an arithmetic number, because the mean of its divisors is an integer number (608363154).

Almost surely, 2^1216726307 is an apocalyptic number.

1216726307 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216726307 is an equidigital number, since it uses as much as digits as its factorization.

1216726307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 1216726307 is about 34881.6041345578. The cubic root of 1216726307 is about 1067.5731258329.

The spelling of 1216726307 in words is "one billion, two hundred sixteen million, seven hundred twenty-six thousand, three hundred seven".