1123129999 has 4 divisors (see below), whose sum is σ = 1134250200. Its totient is φ = 1112009800.

The previous prime is 1123129991. The next prime is 1123130053. The reversal of 1123129999 is 9999213211.

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 1123129999 - 2³ = 1123129991 is a prime.

It is a super-2 number, since 2×1123129999² = 2522841989307480002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123129991) 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, 5559949 + ... + 5560150.

It is an arithmetic number, because the mean of its divisors is an integer number (283562550).

Almost surely, 2^1123129999 is an apocalyptic number.

1123129999 is a deficient number, since it is larger than the sum of its proper divisors (11120201).

1123129999 is a wasteful number, since it uses less digits than its factorization.

1123129999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11120200.

The product of its digits is 78732, while the sum is 46.

The square root of 1123129999 is about 33513.1317396629. The cubic root of 1123129999 is about 1039.4653313723.

The spelling of 1123129999 in words is "one billion, one hundred twenty-three million, one hundred twenty-nine thousand, nine hundred ninety-nine".