1145123243 has 4 divisors (see below), whose sum is σ = 1249225368. Its totient is φ = 1041021120.

The previous prime is 1145123227. The next prime is 1145123251. The reversal of 1145123243 is 3423215411.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1145123243 - 2⁴ = 1145123227 is a prime.

It is a super-2 number, since 2×1145123243² = 2622614483317674098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1145123143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52051046 + ... + 52051067.

It is an arithmetic number, because the mean of its divisors is an integer number (312306342).

Almost surely, 2^1145123243 is an apocalyptic number.

1145123243 is a deficient number, since it is larger than the sum of its proper divisors (104102125).

1145123243 is a wasteful number, since it uses less digits than its factorization.

1145123243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104102124.

The product of its digits is 2880, while the sum is 26.

The square root of 1145123243 is about 33839.6696644633. The cubic root of 1145123243 is about 1046.2064903515.

Adding to 1145123243 its reverse (3423215411), we get a palindrome (4568338654).

The spelling of 1145123243 in words is "one billion, one hundred forty-five million, one hundred twenty-three thousand, two hundred forty-three".