331220123 has 4 divisors (see below), whose sum is σ = 356698608. Its totient is φ = 305741640.

The previous prime is 331220111. The next prime is 331220137. The reversal of 331220123 is 321022133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321022133 = 43 ⋅7465631.

It is a cyclic number.

It is not a de Polignac number, because 331220123 - 2⁶ = 331220059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331220143) 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, 12739223 + ... + 12739248.

It is an arithmetic number, because the mean of its divisors is an integer number (89174652).

Almost surely, 2^331220123 is an apocalyptic number.

331220123 is a deficient number, since it is larger than the sum of its proper divisors (25478485).

331220123 is a wasteful number, since it uses less digits than its factorization.

331220123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25478484.

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

The square root of 331220123 is about 18199.4539203790. The cubic root of 331220123 is about 691.8929488751.

Adding to 331220123 its reverse (321022133), we get a palindrome (652242256).

The spelling of 331220123 in words is "three hundred thirty-one million, two hundred twenty thousand, one hundred twenty-three".