1216022993 has 2 divisors, whose sum is σ = 1216022994. Its totient is φ = 1216022992.

The previous prime is 1216022939. The next prime is 1216023031. The reversal of 1216022993 is 3992206121.

Together with previous prime (1216022939) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633428224 + 582594769 = 25168^2 + 24137^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216022993 - 2¹⁰ = 1216021969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216022923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608011496 + 608011497.

It is an arithmetic number, because the mean of its divisors is an integer number (608011497).

Almost surely, 2^1216022993 is an apocalyptic number.

It is an amenable number.

1216022993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216022993 is an equidigital number, since it uses as much as digits as its factorization.

1216022993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 1216022993 is about 34871.5212315150. The cubic root of 1216022993 is about 1067.3673869200.

It can be divided in two parts, 12160 and 22993, that added together give a palindrome (35153).

The spelling of 1216022993 in words is "one billion, two hundred sixteen million, twenty-two thousand, nine hundred ninety-three".