31121230231 has 8 divisors (see below), whose sum is σ = 38303052704. Its totient is φ = 24623390880.

The previous prime is 31121230207. The next prime is 31121230267. The reversal of 31121230231 is 13203212113.

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

It is a cyclic number.

It is not a de Polignac number, because 31121230231 - 2²⁵ = 31087675799 is a prime.

It is a super-2 number, since 2×31121230231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31121230199 and 31121230208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121230271) 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, 170995680 + ... + 170995861.

It is an arithmetic number, because the mean of its divisors is an integer number (4787881588).

Almost surely, 2^31121230231 is an apocalyptic number.

31121230231 is a deficient number, since it is larger than the sum of its proper divisors (7181822473).

31121230231 is a wasteful number, since it uses less digits than its factorization.

31121230231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341991561.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31121230231 its reverse (13203212113), we get a palindrome (44324442344).

The spelling of 31121230231 in words is "thirty-one billion, one hundred twenty-one million, two hundred thirty thousand, two hundred thirty-one".