1145123112 has 128 divisors (see below), whose sum is σ = 3393653760. Its totient is φ = 315194880.

The previous prime is 1145123099. The next prime is 1145123113. The reversal of 1145123112 is 2113215411.

It is a super-2 number, since 2×1145123112² = 2622613883273129088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1145123113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 570703 + ... + 572705.

It is an arithmetic number, because the mean of its divisors is an integer number (26512920).

Almost surely, 2^1145123112 is an apocalyptic number.

1145123112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1145123112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1696826880).

1145123112 is an abundant number, since it is smaller than the sum of its proper divisors (2248530648).

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

1145123112 is a wasteful number, since it uses less digits than its factorization.

1145123112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143 (or 2139 counting only the distinct ones).

The product of its digits is 240, while the sum is 21.

The square root of 1145123112 is about 33839.6677288652. The cubic root of 1145123112 is about 1046.2064504568.

Adding to 1145123112 its reverse (2113215411), we get a palindrome (3258338523).

The spelling of 1145123112 in words is "one billion, one hundred forty-five million, one hundred twenty-three thousand, one hundred twelve".