31120000205 has 48 divisors (see below), whose sum is σ = 45115709760. Its totient is φ = 20531605248.

The previous prime is 31120000181. The next prime is 31120000207. The reversal of 31120000205 is 50200002113.

It is a happy number.

It is not a de Polignac number, because 31120000205 - 2¹² = 31119996109 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31120000205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120000207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 683801 + ... + 727889.

It is an arithmetic number, because the mean of its divisors is an integer number (939910620).

Almost surely, 2^31120000205 is an apocalyptic number.

31120000205 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31120000205 is a deficient number, since it is larger than the sum of its proper divisors (13995709555).

31120000205 is a wasteful number, since it uses less digits than its factorization.

31120000205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44218 (or 44211 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

Adding to 31120000205 its reverse (50200002113), we get a palindrome (81320002318).

The spelling of 31120000205 in words is "thirty-one billion, one hundred twenty million, two hundred five", and thus it is an aban number.