1154689123 has 4 divisors (see below), whose sum is σ = 1319644720. Its totient is φ = 989733528.

The previous prime is 1154689121. The next prime is 1154689153. The reversal of 1154689123 is 3219864511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3219864511 = 22697 ⋅141863.

It is not a de Polignac number, because 1154689123 - 2¹ = 1154689121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1154689121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82477788 + ... + 82477801.

It is an arithmetic number, because the mean of its divisors is an integer number (329911180).

Almost surely, 2^1154689123 is an apocalyptic number.

1154689123 is a deficient number, since it is larger than the sum of its proper divisors (164955597).

1154689123 is an equidigital number, since it uses as much as digits as its factorization.

1154689123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164955596.

The product of its digits is 51840, while the sum is 40.

The square root of 1154689123 is about 33980.7169288701. The cubic root of 1154689123 is about 1049.1116062235. Note that the first 3 decimals are identical.

The spelling of 1154689123 in words is "one billion, one hundred fifty-four million, six hundred eighty-nine thousand, one hundred twenty-three".