2115554123 has 4 divisors (see below), whose sum is σ = 2121136440. Its totient is φ = 2109971808.

The previous prime is 2115554117. The next prime is 2115554131. The reversal of 2115554123 is 3214555112.

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 2115554123 - 2¹⁸ = 2115291979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2115554423) 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, 2790590 + ... + 2791347.

It is an arithmetic number, because the mean of its divisors is an integer number (530284110).

Almost surely, 2^2115554123 is an apocalyptic number.

2115554123 is a deficient number, since it is larger than the sum of its proper divisors (5582317).

2115554123 is an equidigital number, since it uses as much as digits as its factorization.

2115554123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582316.

The product of its digits is 6000, while the sum is 29.

The square root of 2115554123 is about 45995.1532555333. The cubic root of 2115554123 is about 1283.7330238414.

The spelling of 2115554123 in words is "two billion, one hundred fifteen million, five hundred fifty-four thousand, one hundred twenty-three".