31142204320 has 48 divisors (see below), whose sum is σ = 74110542408. Its totient is φ = 12365946880.

The previous prime is 31142204299. The next prime is 31142204329. The reversal of 31142204320 is 2340224113.

It can be written as a sum of positive squares in 4 ways, for example, as 27730242576 + 3411961744 = 166524^2 + 58412^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31142204291 and 31142204300.

It is not an unprimeable number, because it can be changed into a prime (31142204329) 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 7 ways as a sum of consecutive naturals, for example, 688441 + ... + 732280.

Almost surely, 2^31142204320 is an apocalyptic number.

It is an amenable number.

31142204320 is an abundant number, since it is smaller than the sum of its proper divisors (42968338088).

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

31142204320 is a wasteful number, since it uses less digits than its factorization.

31142204320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420873 (or 1420865 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 31142204320 its reverse (2340224113), we get a palindrome (33482428433).

The spelling of 31142204320 in words is "thirty-one billion, one hundred forty-two million, two hundred four thousand, three hundred twenty".