31331030121 has 40 divisors (see below), whose sum is σ = 49979001600. Its totient is φ = 19516502880.

The previous prime is 31331030113. The next prime is 31331030149. The reversal of 31331030121 is 12103013313.

It is a happy number.

31331030121 is a `hidden beast` number, since 31 + 3 + 310 + 301 + 21 = 666.

It is not a de Polignac number, because 31331030121 - 2³ = 31331030113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31331030094 and 31331030103.

It is not an unprimeable number, because it can be changed into a prime (31331037121) 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 39 ways as a sum of consecutive naturals, for example, 142311 + ... + 287948.

It is an arithmetic number, because the mean of its divisors is an integer number (1249475040).

Almost surely, 2^31331030121 is an apocalyptic number.

31331030121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31331030121 is a deficient number, since it is larger than the sum of its proper divisors (18647971479).

31331030121 is a wasteful number, since it uses less digits than its factorization.

31331030121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430331 (or 430322 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31331030121 its reverse (12103013313), we get a palindrome (43434043434).

The spelling of 31331030121 in words is "thirty-one billion, three hundred thirty-one million, thirty thousand, one hundred twenty-one".