1123397911 has 16 divisors (see below), whose sum is σ = 1201845600. Its totient is φ = 1048215168.

The previous prime is 1123397897. The next prime is 1123397929. The reversal of 1123397911 is 1197933211.

It is a cyclic number.

It is not a de Polignac number, because 1123397911 - 2⁵ = 1123397879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123391911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97525 + ... + 108433.

It is an arithmetic number, because the mean of its divisors is an integer number (75115350).

Almost surely, 2^1123397911 is an apocalyptic number.

1123397911 is a deficient number, since it is larger than the sum of its proper divisors (78447689).

1123397911 is a wasteful number, since it uses less digits than its factorization.

1123397911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11058.

The product of its digits is 10206, while the sum is 37.

The square root of 1123397911 is about 33517.1286210499. The cubic root of 1123397911 is about 1039.5479763305.

The spelling of 1123397911 in words is "one billion, one hundred twenty-three million, three hundred ninety-seven thousand, nine hundred eleven".