1216647671 has 2 divisors, whose sum is σ = 1216647672. Its totient is φ = 1216647670.

The previous prime is 1216647661. The next prime is 1216647683. The reversal of 1216647671 is 1767466121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1216647671 - 2²² = 1212453367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216647631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608323835 + 608323836.

It is an arithmetic number, because the mean of its divisors is an integer number (608323836).

Almost surely, 2^1216647671 is an apocalyptic number.

1216647671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216647671 is an equidigital number, since it uses as much as digits as its factorization.

1216647671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 1216647671 is about 34880.4769319458. The cubic root of 1216647671 is about 1067.5501265523.

The spelling of 1216647671 in words is "one billion, two hundred sixteen million, six hundred forty-seven thousand, six hundred seventy-one".