123011213 has 6 divisors (see below), whose sum is σ = 133201674. Its totient is φ = 113548656.

The previous prime is 123011177. The next prime is 123011219. The reversal of 123011213 is 312110321.

It can be written as a sum of positive squares in 3 ways, for example, as 4919524 + 118091689 = 2218^2 + 10867^2 .

It is not a de Polignac number, because 123011213 - 2¹⁸ = 122749069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123011219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 363770 + ... + 364107.

It is an arithmetic number, because the mean of its divisors is an integer number (22200279).

Almost surely, 2^123011213 is an apocalyptic number.

123011213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

123011213 is a deficient number, since it is larger than the sum of its proper divisors (10190461).

123011213 is an equidigital number, since it uses as much as digits as its factorization.

123011213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727903 (or 727890 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 123011213 is about 11091.0420159695. The cubic root of 123011213 is about 497.3340951651.

Adding to 123011213 its reverse (312110321), we get a palindrome (435121534).

The spelling of 123011213 in words is "one hundred twenty-three million, eleven thousand, two hundred thirteen".