31230231231 has 4 divisors (see below), whose sum is σ = 41640308312. Its totient is φ = 20820154152.

The previous prime is 31230231187. The next prime is 31230231233. The reversal of 31230231231 is 13213203213.

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

It is not a de Polignac number, because 31230231231 - 2⁷ = 31230231103 is a prime.

It is a super-2 number, since 2×31230231231² (a number of 22 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 = 31230231198 and 31230231207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230231233) 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, 5205038536 + ... + 5205038541.

It is an arithmetic number, because the mean of its divisors is an integer number (10410077078).

Almost surely, 2^31230231231 is an apocalyptic number.

31230231231 is a deficient number, since it is larger than the sum of its proper divisors (10410077081).

31230231231 is a wasteful number, since it uses less digits than its factorization.

31230231231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10410077080.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31230231231 its reverse (13213203213), we get a palindrome (44443434444).

The spelling of 31230231231 in words is "thirty-one billion, two hundred thirty million, two hundred thirty-one thousand, two hundred thirty-one".