123220311 has 4 divisors (see below), whose sum is σ = 164293752. Its totient is φ = 82146872.

The previous prime is 123220309. The next prime is 123220313. The reversal of 123220311 is 113022321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113022321 = 3 ⋅37674107.

It is an interprime number because it is at equal distance from previous prime (123220309) and next prime (123220313).

It is a cyclic number.

It is not a de Polignac number, because 123220311 - 2¹ = 123220309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123220313) 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, 20536716 + ... + 20536721.

It is an arithmetic number, because the mean of its divisors is an integer number (41073438).

Almost surely, 2^123220311 is an apocalyptic number.

123220311 is a deficient number, since it is larger than the sum of its proper divisors (41073441).

123220311 is an equidigital number, since it uses as much as digits as its factorization.

123220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41073440.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 123220311 is about 11100.4644497426. The cubic root of 123220311 is about 497.6157299176.

Adding to 123220311 its reverse (113022321), we get a palindrome (236242632).

The spelling of 123220311 in words is "one hundred twenty-three million, two hundred twenty thousand, three hundred eleven".