1123979511 has 4 divisors (see below), whose sum is σ = 1498639352. Its totient is φ = 749319672.

The previous prime is 1123979503. The next prime is 1123979513. The reversal of 1123979511 is 1159793211.

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

It is not a de Polignac number, because 1123979511 - 2³ = 1123979503 is a prime.

It is a super-2 number, since 2×1123979511² = 2526659882295598242, 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 1123979511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123979513) 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, 187329916 + ... + 187329921.

It is an arithmetic number, because the mean of its divisors is an integer number (374659838).

Almost surely, 2^1123979511 is an apocalyptic number.

1123979511 is a deficient number, since it is larger than the sum of its proper divisors (374659841).

1123979511 is an equidigital number, since it uses as much as digits as its factorization.

1123979511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374659840.

The product of its digits is 17010, while the sum is 39.

The square root of 1123979511 is about 33525.8036592712. The cubic root of 1123979511 is about 1039.7273419230.

The spelling of 1123979511 in words is "one billion, one hundred twenty-three million, nine hundred seventy-nine thousand, five hundred eleven".