123011133205 has 4 divisors (see below), whose sum is σ = 147613359852. Its totient is φ = 98408906560.

The previous prime is 123011133053. The next prime is 123011133233. The reversal of 123011133205 is 502331110321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502331110321 = 47881 ⋅10491241.

It can be written as a sum of positive squares in 2 ways, for example, as 35762970321 + 87248162884 = 189111^2 + 295378^2 .

It is not a de Polignac number, because 123011133205 - 2¹¹ = 123011131157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 12301113316 + ... + 12301113325.

It is an arithmetic number, because the mean of its divisors is an integer number (36903339963).

Almost surely, 2^123011133205 is an apocalyptic number.

It is an amenable number.

123011133205 is a deficient number, since it is larger than the sum of its proper divisors (24602226647).

123011133205 is an equidigital number, since it uses as much as digits as its factorization.

123011133205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24602226646.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 123011133205 its reverse (502331110321), we get a palindrome (625342243526).

The spelling of 123011133205 in words is "one hundred twenty-three billion, eleven million, one hundred thirty-three thousand, two hundred five".