31130222236 has 12 divisors (see below), whose sum is σ = 54481760928. Its totient is φ = 15564004832.

The previous prime is 31130222203. The next prime is 31130222237. The reversal of 31130222236 is 63222203113.

It is a self number, because there is not a number n which added to its sum of digits gives 31130222236.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130222237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211561 + ... + 327136.

It is an arithmetic number, because the mean of its divisors is an integer number (4540146744).

Almost surely, 2^31130222236 is an apocalyptic number.

It is an amenable number.

31130222236 is a deficient number, since it is larger than the sum of its proper divisors (23351538692).

31130222236 is a wasteful number, since it uses less digits than its factorization.

31130222236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553148 (or 553146 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 31130222236 its reverse (63222203113), we get a palindrome (94352425349).

The spelling of 31130222236 in words is "thirty-one billion, one hundred thirty million, two hundred twenty-two thousand, two hundred thirty-six".