1145243172 has 24 divisors (see below), whose sum is σ = 2729091456. Its totient is φ = 373625248.

The previous prime is 1145243093. The next prime is 1145243173. The reversal of 1145243172 is 2713425411.

It is not an unprimeable number, because it can be changed into a prime (1145243173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1014723 + ... + 1015850.

It is an arithmetic number, because the mean of its divisors is an integer number (113712144).

Almost surely, 2^1145243172 is an apocalyptic number.

1145243172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1145243172 is an abundant number, since it is smaller than the sum of its proper divisors (1583848284).

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

1145243172 is a wasteful number, since it uses less digits than its factorization.

1145243172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030627 (or 2030625 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 1145243172 is about 33841.4416359587. The cubic root of 1145243172 is about 1046.2430122191.

Adding to 1145243172 its reverse (2713425411), we get a palindrome (3858668583).

The spelling of 1145243172 in words is "one billion, one hundred forty-five million, two hundred forty-three thousand, one hundred seventy-two".