1113221718 has 80 divisors (see below), whose sum is σ = 2942843904. Its totient is φ = 307793520.

The previous prime is 1113221653. The next prime is 1113221737. The reversal of 1113221718 is 8171223111.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1113221691 and 1113221700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19321 + ... + 50987.

Almost surely, 2^1113221718 is an apocalyptic number.

1113221718 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1113221718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1471421952).

1113221718 is an abundant number, since it is smaller than the sum of its proper divisors (1829622186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1113221718 is a wasteful number, since it uses less digits than its factorization.

1113221718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31719 (or 31710 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 1113221718 is about 33364.9774164467. The cubic root of 1113221718 is about 1036.3995684721.

Adding to 1113221718 its reverse (8171223111), we get a palindrome (9284444829).

The spelling of 1113221718 in words is "one billion, one hundred thirteen million, two hundred twenty-one thousand, seven hundred eighteen".