231131220331 has 8 divisors (see below), whose sum is σ = 253244214000. Its totient is φ = 209201737440.

The previous prime is 231131220253. The next prime is 231131220409. The reversal of 231131220331 is 133022131132.

It is an interprime number because it is at equal distance from previous prime (231131220253) and next prime (231131220409).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231131220331 is a prime.

It is a super-2 number, since 2×231131220331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231131220031) 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, 45875056 + ... + 45880093.

It is an arithmetic number, because the mean of its divisors is an integer number (31655526750).

Almost surely, 2^231131220331 is an apocalyptic number.

231131220331 is a deficient number, since it is larger than the sum of its proper divisors (22112993669).

231131220331 is a wasteful number, since it uses less digits than its factorization.

231131220331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91755389.

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

Adding to 231131220331 its reverse (133022131132), we get a palindrome (364153351463).

The spelling of 231131220331 in words is "two hundred thirty-one billion, one hundred thirty-one million, two hundred twenty thousand, three hundred thirty-one".