320121231 has 4 divisors (see below), whose sum is σ = 426828312. Its totient is φ = 213414152.

The previous prime is 320121211. The next prime is 320121247. The reversal of 320121231 is 132121023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132121023 = 3 ⋅44040341.

It is a cyclic number.

It is not a de Polignac number, because 320121231 - 2⁶ = 320121167 is a prime.

It is a super-2 number, since 2×320121231² = 204955205073910722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 320121231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320121211) 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, 53353536 + ... + 53353541.

It is an arithmetic number, because the mean of its divisors is an integer number (106707078).

Almost surely, 2^320121231 is an apocalyptic number.

320121231 is a deficient number, since it is larger than the sum of its proper divisors (106707081).

320121231 is a wasteful number, since it uses less digits than its factorization.

320121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106707080.

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

The square root of 320121231 is about 17891.9320085898. The cubic root of 320121231 is about 684.0767436377.

Adding to 320121231 its reverse (132121023), we get a palindrome (452242254).

The spelling of 320121231 in words is "three hundred twenty million, one hundred twenty-one thousand, two hundred thirty-one".