123220331 has 4 divisors (see below), whose sum is σ = 132698832. Its totient is φ = 113741832.

The previous prime is 123220313. The next prime is 123220337. The reversal of 123220331 is 133022321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133022321 = 2039 ⋅65239.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123220331 is a prime.

It is a super-2 number, since 2×123220331² = 30366499943499122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123220337) 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, 4739231 + ... + 4739256.

It is an arithmetic number, because the mean of its divisors is an integer number (33174708).

Almost surely, 2^123220331 is an apocalyptic number.

123220331 is a deficient number, since it is larger than the sum of its proper divisors (9478501).

123220331 is an equidigital number, since it uses as much as digits as its factorization.

123220331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9478500.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 123220331 is about 11100.4653506058. The cubic root of 123220331 is about 497.6157568405.

Adding to 123220331 its reverse (133022321), we get a palindrome (256242652).

The spelling of 123220331 in words is "one hundred twenty-three million, two hundred twenty thousand, three hundred thirty-one".