1216417723 has 2 divisors, whose sum is σ = 1216417724. Its totient is φ = 1216417722.

The previous prime is 1216417717. The next prime is 1216417757. The reversal of 1216417723 is 3277146121.

It is an a-pointer prime, because the next prime (1216417757) can be obtained adding 1216417723 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1216417723 - 2⁹ = 1216417211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216417703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608208861 + 608208862.

It is an arithmetic number, because the mean of its divisors is an integer number (608208862).

Almost surely, 2^1216417723 is an apocalyptic number.

1216417723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216417723 is an equidigital number, since it uses as much as digits as its factorization.

1216417723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 1216417723 is about 34877.1805483184. The cubic root of 1216417723 is about 1067.4828661917.

The spelling of 1216417723 in words is "one billion, two hundred sixteen million, four hundred seventeen thousand, seven hundred twenty-three".