31142120 has 16 divisors (see below), whose sum is σ = 70069860. Its totient is φ = 12456832.

The previous prime is 31142119. The next prime is 31142129. The reversal of 31142120 is 2124113.

It can be written as a sum of positive squares in 2 ways, for example, as 30492484 + 649636 = 5522^2 + 806^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31142095 and 31142104.

It is not an unprimeable number, because it can be changed into a prime (31142129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389237 + ... + 389316.

Almost surely, 2^31142120 is an apocalyptic number.

It is an amenable number.

31142120 is an abundant number, since it is smaller than the sum of its proper divisors (38927740).

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

31142120 is a wasteful number, since it uses less digits than its factorization.

31142120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778564 (or 778560 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 31142120 is about 5580.5125212654. The cubic root of 31142120 is about 314.6173905012.

Adding to 31142120 its reverse (2124113), we get a palindrome (33266233).

The spelling of 31142120 in words is "thirty-one million, one hundred forty-two thousand, one hundred twenty".