31143444400 has 60 divisors (see below), whose sum is σ = 78075284112. Its totient is φ = 11915749120.

The previous prime is 31143444391. The next prime is 31143444401. The reversal of 31143444400 is 444434113.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31143444401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1683379 + ... + 1701778.

Almost surely, 2^31143444400 is an apocalyptic number.

It is an amenable number.

31143444400 is an abundant number, since it is smaller than the sum of its proper divisors (46931839712).

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

31143444400 is a wasteful number, since it uses less digits than its factorization.

31143444400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3385198 (or 3385187 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 31143444400 its reverse (444434113), we get a palindrome (31587878513).

The spelling of 31143444400 in words is "thirty-one billion, one hundred forty-three million, four hundred forty-four thousand, four hundred".