312321231231 has 4 divisors (see below), whose sum is σ = 416428308312. Its totient is φ = 208214154152.

The previous prime is 312321231191. The next prime is 312321231289. The reversal of 312321231231 is 132132123213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 312321231231 - 2¹⁵ = 312321198463 is a prime.

It is a super-2 number, since 2×312321231231² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312321231331) 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, 52053538536 + ... + 52053538541.

It is an arithmetic number, because the mean of its divisors is an integer number (104107077078).

Almost surely, 2^312321231231 is an apocalyptic number.

312321231231 is a deficient number, since it is larger than the sum of its proper divisors (104107077081).

312321231231 is a wasteful number, since it uses less digits than its factorization.

312321231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104107077080.

The product of its digits is 1296, while the sum is 24.

Adding to 312321231231 its reverse (132132123213), we get a palindrome (444453354444).

The spelling of 312321231231 in words is "three hundred twelve billion, three hundred twenty-one million, two hundred thirty-one thousand, two hundred thirty-one".