31431222204 has 48 divisors (see below), whose sum is σ = 75380688768. Its totient is φ = 10185922368.

The previous prime is 31431222203. The next prime is 31431222211. The reversal of 31431222204 is 40222213413.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31431222203) 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 15 ways as a sum of consecutive naturals, for example, 553227 + ... + 607389.

It is an arithmetic number, because the mean of its divisors is an integer number (1570431016).

Almost surely, 2^31431222204 is an apocalyptic number.

It is an amenable number.

31431222204 is an abundant number, since it is smaller than the sum of its proper divisors (43949466564).

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

31431222204 is a wasteful number, since it uses less digits than its factorization.

31431222204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55514 (or 55512 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31431222204 its reverse (40222213413), we get a palindrome (71653435617).

The spelling of 31431222204 in words is "thirty-one billion, four hundred thirty-one million, two hundred twenty-two thousand, two hundred four".