31230120331 has 4 divisors (see below), whose sum is σ = 31267793200. Its totient is φ = 31192447464.

The previous prime is 31230120287. The next prime is 31230120343. The reversal of 31230120331 is 13302103213.

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 31230120331 - 2¹⁵ = 31230087563 is a prime.

It is a super-2 number, since 2×31230120331² (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 = 31230120299 and 31230120308.

It is not an unprimeable number, because it can be changed into a prime (31230120731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18835191 + ... + 18836848.

It is an arithmetic number, because the mean of its divisors is an integer number (7816948300).

Almost surely, 2^31230120331 is an apocalyptic number.

31230120331 is a deficient number, since it is larger than the sum of its proper divisors (37672869).

31230120331 is an equidigital number, since it uses as much as digits as its factorization.

31230120331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37672868.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31230120331 its reverse (13302103213), we get a palindrome (44532223544).

The spelling of 31230120331 in words is "thirty-one billion, two hundred thirty million, one hundred twenty thousand, three hundred thirty-one".