123040511 has 4 divisors (see below), whose sum is σ = 134226024. Its totient is φ = 111855000.

The previous prime is 123040493. The next prime is 123040513. The reversal of 123040511 is 115040321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115040321 = 11 ⋅10458211.

It is a cyclic number.

It is not a de Polignac number, because 123040511 - 2²² = 118846207 is a prime.

It is a super-2 number, since 2×123040511² = 30277934694282242, 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 123040511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123040513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5592740 + ... + 5592761.

It is an arithmetic number, because the mean of its divisors is an integer number (33556506).

Almost surely, 2^123040511 is an apocalyptic number.

123040511 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123040511 is a deficient number, since it is larger than the sum of its proper divisors (11185513).

123040511 is a wasteful number, since it uses less digits than its factorization.

123040511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11185512.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 123040511 is about 11092.3627329798. The cubic root of 123040511 is about 497.3735759499.

Adding to 123040511 its reverse (115040321), we get a palindrome (238080832).

The spelling of 123040511 in words is "one hundred twenty-three million, forty thousand, five hundred eleven".