1123145643 has 4 divisors (see below), whose sum is σ = 1497527528. Its totient is φ = 748763760.

The previous prime is 1123145627. The next prime is 1123145671. The reversal of 1123145643 is 3465413211.

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

It is not a de Polignac number, because 1123145643 - 2⁴ = 1123145627 is a prime.

It is a super-2 number, since 2×1123145643² = 2522912270779766898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1123145643.

It is not an unprimeable number, because it can be changed into a prime (1123140643) 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, 187190938 + ... + 187190943.

It is an arithmetic number, because the mean of its divisors is an integer number (374381882).

Almost surely, 2^1123145643 is an apocalyptic number.

1123145643 is a deficient number, since it is larger than the sum of its proper divisors (374381885).

1123145643 is an equidigital number, since it uses as much as digits as its factorization.

1123145643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374381884.

The product of its digits is 8640, while the sum is 30.

The square root of 1123145643 is about 33513.3651398961. The cubic root of 1123145643 is about 1039.4701575634.

Adding to 1123145643 its reverse (3465413211), we get a palindrome (4588558854).

The spelling of 1123145643 in words is "one billion, one hundred twenty-three million, one hundred forty-five thousand, six hundred forty-three".