1223916111 has 24 divisors (see below), whose sum is σ = 1953020160. Its totient is φ = 732373200.

The previous prime is 1223916107. The next prime is 1223916131. The reversal of 1223916111 is 1116193221.

It is a happy number.

1223916111 is a `hidden beast` number, since 12 + 2 + 39 + 1 + 611 + 1 = 666.

It is not a de Polignac number, because 1223916111 - 2² = 1223916107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223916131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70425 + ... + 86066.

It is an arithmetic number, because the mean of its divisors is an integer number (81375840).

Almost surely, 2^1223916111 is an apocalyptic number.

1223916111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1223916111 is a deficient number, since it is larger than the sum of its proper divisors (729104049).

1223916111 is a wasteful number, since it uses less digits than its factorization.

1223916111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156587 (or 156584 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 1223916111 is about 34984.5124447948. The cubic root of 1223916111 is about 1069.6718098495.

The spelling of 1223916111 in words is "one billion, two hundred twenty-three million, nine hundred sixteen thousand, one hundred eleven".