31130303121 has 12 divisors (see below), whose sum is σ = 45030148020. Its totient is φ = 20723925600.

The previous prime is 31130303107. The next prime is 31130303147. The reversal of 31130303121 is 12130303113.

It is a happy number.

31130303121 is a `hidden beast` number, since 311 + 30 + 303 + 1 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19716372225 + 11413930896 = 140415^2 + 106836^2 .

It is not a de Polignac number, because 31130303121 - 2²³ = 31121914513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31130303094 and 31130303103.

It is not an unprimeable number, because it can be changed into a prime (31130303021) 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 11 ways as a sum of consecutive naturals, for example, 2460826 + ... + 2473443.

It is an arithmetic number, because the mean of its divisors is an integer number (3752512335).

Almost surely, 2^31130303121 is an apocalyptic number.

It is an amenable number.

31130303121 is a deficient number, since it is larger than the sum of its proper divisors (13899844899).

31130303121 is a wasteful number, since it uses less digits than its factorization.

31130303121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4934976 (or 4934973 counting only the distinct ones).

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

Adding to 31130303121 its reverse (12130303113), we get a palindrome (43260606234).

The spelling of 31130303121 in words is "thirty-one billion, one hundred thirty million, three hundred three thousand, one hundred twenty-one".