123311213 has 4 divisors (see below), whose sum is σ = 123562848. Its totient is φ = 123059580.

The previous prime is 123311207. The next prime is 123311249. The reversal of 123311213 is 312113321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 312113321 = 13 ⋅24008717.

It is a cyclic number.

It is not a de Polignac number, because 123311213 - 2¹⁰ = 123310189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123311191 and 123311200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123311413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125081 + ... + 126062.

It is an arithmetic number, because the mean of its divisors is an integer number (30890712).

Almost surely, 2^123311213 is an apocalyptic number.

It is an amenable number.

123311213 is a deficient number, since it is larger than the sum of its proper divisors (251635).

123311213 is an equidigital number, since it uses as much as digits as its factorization.

123311213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251634.

The product of its digits is 108, while the sum is 17.

The square root of 123311213 is about 11104.5582082314. The cubic root of 123311213 is about 497.7380667463.

Adding to 123311213 its reverse (312113321), we get a palindrome (435424534).

The spelling of 123311213 in words is "one hundred twenty-three million, three hundred eleven thousand, two hundred thirteen".