31431120324 has 24 divisors (see below), whose sum is σ = 74051315520. Its totient is φ = 10375320864.

The previous prime is 31431120323. The next prime is 31431120349. The reversal of 31431120324 is 42302113413.

It is a happy number.

It is a super-3 number, since 3×31431120324³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31431120294 and 31431120303.

It is not an unprimeable number, because it can be changed into a prime (31431120323) 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 7 ways as a sum of consecutive naturals, for example, 12713619 + ... + 12716090.

It is an arithmetic number, because the mean of its divisors is an integer number (3085471480).

Almost surely, 2^31431120324 is an apocalyptic number.

It is an amenable number.

31431120324 is an abundant number, since it is smaller than the sum of its proper divisors (42620195196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31431120324 is a wasteful number, since it uses less digits than its factorization.

31431120324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25429819 (or 25429817 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 31431120324 its reverse (42302113413), we get a palindrome (73733233737).

The spelling of 31431120324 in words is "thirty-one billion, four hundred thirty-one million, one hundred twenty thousand, three hundred twenty-four".