31012443200 has 84 divisors (see below), whose sum is σ = 76985751540. Its totient is φ = 12295127040.

The previous prime is 31012443191. The next prime is 31012443221. The reversal of 31012443200 is 234421013.

It can be written as a sum of positive squares in 6 ways, for example, as 7789121536 + 23223321664 = 88256^2 + 152392^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95036 + ... + 266564.

Almost surely, 2^31012443200 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31012443200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38492875770).

31012443200 is an abundant number, since it is smaller than the sum of its proper divisors (45973308340).

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

31012443200 is a wasteful number, since it uses less digits than its factorization.

31012443200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171664 (or 171649 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31012443200 its reverse (234421013), we get a palindrome (31246864213).

The spelling of 31012443200 in words is "thirty-one billion, twelve million, four hundred forty-three thousand, two hundred".