31230231121 has 4 divisors (see below), whose sum is σ = 31256410212. Its totient is φ = 31204052032.

The previous prime is 31230231103. The next prime is 31230231127. The reversal of 31230231121 is 12113203213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12113203213 = 12919 ⋅937627.

It can be written as a sum of positive squares in 2 ways, for example, as 19033237521 + 12196993600 = 137961^2 + 110440^2 .

It is a cyclic number.

It is not a de Polignac number, because 31230231121 - 2⁹ = 31230230609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31230231127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13087756 + ... + 13090141.

It is an arithmetic number, because the mean of its divisors is an integer number (7814102553).

Almost surely, 2^31230231121 is an apocalyptic number.

It is an amenable number.

31230231121 is a deficient number, since it is larger than the sum of its proper divisors (26179091).

31230231121 is a wasteful number, since it uses less digits than its factorization.

31230231121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26179090.

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

Adding to 31230231121 its reverse (12113203213), we get a palindrome (43343434334).

The spelling of 31230231121 in words is "thirty-one billion, two hundred thirty million, two hundred thirty-one thousand, one hundred twenty-one".