1123456691 has 4 divisors (see below), whose sum is σ = 1283950512. Its totient is φ = 962962872.

The previous prime is 1123456687. The next prime is 1123456693. The reversal of 1123456691 is 1966543211.

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 1123456691 - 2² = 1123456687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123456693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80246900 + ... + 80246913.

It is an arithmetic number, because the mean of its divisors is an integer number (320987628).

Almost surely, 2^1123456691 is an apocalyptic number.

1123456691 is a deficient number, since it is larger than the sum of its proper divisors (160493821).

1123456691 is an equidigital number, since it uses as much as digits as its factorization.

1123456691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160493820.

The product of its digits is 38880, while the sum is 38.

The square root of 1123456691 is about 33518.0054746699. The cubic root of 1123456691 is about 1039.5661069097.

The spelling of 1123456691 in words is "one billion, one hundred twenty-three million, four hundred fifty-six thousand, six hundred ninety-one".