231211443031 has 4 divisors (see below), whose sum is σ = 231215374152. Its totient is φ = 231207511912.

The previous prime is 231211443013. The next prime is 231211443041. The reversal of 231211443031 is 130344112132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231211443031 is a prime.

It is a super-2 number, since 2×231211443031² (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 = 231211442987 and 231211443005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231211443011) 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, 1875976 + ... + 1995421.

It is an arithmetic number, because the mean of its divisors is an integer number (57803843538).

Almost surely, 2^231211443031 is an apocalyptic number.

231211443031 is a deficient number, since it is larger than the sum of its proper divisors (3931121).

231211443031 is an equidigital number, since it uses as much as digits as its factorization.

231211443031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3931120.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 231211443031 its reverse (130344112132), we get a palindrome (361555555163).

The spelling of 231211443031 in words is "two hundred thirty-one billion, two hundred eleven million, four hundred forty-three thousand, thirty-one".