31351121332 has 12 divisors (see below), whose sum is σ = 54881581860. Its totient is φ = 15670669376.

The previous prime is 31351121327. The next prime is 31351121339. The reversal of 31351121332 is 23312115313.

It can be written as a sum of positive squares in 2 ways, for example, as 8545893136 + 22805228196 = 92444^2 + 151014^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31351121297 and 31351121306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31351121339) 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, 1208383 + ... + 1234054.

It is an arithmetic number, because the mean of its divisors is an integer number (4573465155).

Almost surely, 2^31351121332 is an apocalyptic number.

It is an amenable number.

31351121332 is a deficient number, since it is larger than the sum of its proper divisors (23530460528).

31351121332 is a wasteful number, since it uses less digits than its factorization.

31351121332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445650 (or 2445648 counting only the distinct ones).

The product of its digits is 1620, while the sum is 25.

Adding to 31351121332 its reverse (23312115313), we get a palindrome (54663236645).

The spelling of 31351121332 in words is "thirty-one billion, three hundred fifty-one million, one hundred twenty-one thousand, three hundred thirty-two".