312123331231 has 4 divisors (see below), whose sum is σ = 328550875000. Its totient is φ = 295695787464.

The previous prime is 312123331211. The next prime is 312123331259. The reversal of 312123331231 is 132133321213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132133321213 = 19 ⋅6954385327.

It is a cyclic number.

It is not a de Polignac number, because 312123331231 - 2⁷ = 312123331103 is a prime.

It is a super-2 number, since 2×312123331231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312123331196 and 312123331205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312123331211) 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, 8213771856 + ... + 8213771893.

It is an arithmetic number, because the mean of its divisors is an integer number (82137718750).

Almost surely, 2^312123331231 is an apocalyptic number.

312123331231 is a deficient number, since it is larger than the sum of its proper divisors (16427543769).

312123331231 is a wasteful number, since it uses less digits than its factorization.

312123331231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16427543768.

The product of its digits is 1944, while the sum is 25.

Adding to 312123331231 its reverse (132133321213), we get a palindrome (444256652444).

The spelling of 312123331231 in words is "three hundred twelve billion, one hundred twenty-three million, three hundred thirty-one thousand, two hundred thirty-one".