31123231231 has 8 divisors (see below), whose sum is σ = 32130691200. Its totient is φ = 30115989120.

The previous prime is 31123231229. The next prime is 31123231289. The reversal of 31123231231 is 13213232113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31123231231 - 2¹ = 31123231229 is a prime.

It is a super-2 number, since 2×31123231231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123261231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265875 + ... + 364603.

It is an arithmetic number, because the mean of its divisors is an integer number (4016336400).

Almost surely, 2^31123231231 is an apocalyptic number.

31123231231 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31123231231 is a deficient number, since it is larger than the sum of its proper divisors (1007459969).

31123231231 is a wasteful number, since it uses less digits than its factorization.

31123231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108929.

The product of its digits is 648, while the sum is 22.

Adding to 31123231231 its reverse (13213232113), we get a palindrome (44336463344).

The spelling of 31123231231 in words is "thirty-one billion, one hundred twenty-three million, two hundred thirty-one thousand, two hundred thirty-one".