231320220031 has 4 divisors (see below), whose sum is σ = 231435940000. Its totient is φ = 231204500064.

The previous prime is 231320220007. The next prime is 231320220083. The reversal of 231320220031 is 130022023132.

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 231320220031 - 2¹¹ = 231320217983 is a prime.

It is a super-2 number, since 2×231320220031² (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 = 231320219990 and 231320220008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231320220091) 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, 57856986 + ... + 57860983.

It is an arithmetic number, because the mean of its divisors is an integer number (57858985000).

Almost surely, 2^231320220031 is an apocalyptic number.

231320220031 is a deficient number, since it is larger than the sum of its proper divisors (115719969).

231320220031 is a wasteful number, since it uses less digits than its factorization.

231320220031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115719968.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 231320220031 its reverse (130022023132), we get a palindrome (361342243163).

The spelling of 231320220031 in words is "two hundred thirty-one billion, three hundred twenty million, two hundred twenty thousand, thirty-one".