31543180816 has 45 divisors (see below), whose sum is σ = 71104067631. Its totient is φ = 13516374816.

The previous prime is 31543180811. The next prime is 31543180873. The reversal of 31543180816 is 61808134513.

It is a happy number.

The square root of 31543180816 is 177604.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31543180811) 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 8 ways as a sum of consecutive naturals, for example, 4969741 + ... + 4976083.

Almost surely, 2^31543180816 is an apocalyptic number.

31543180816 is the 177604-th square number.

It is an amenable number.

31543180816 is an abundant number, since it is smaller than the sum of its proper divisors (39560886815).

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

31543180816 is an frugal number, since it uses more digits than its factorization.

31543180816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12708 (or 6352 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 31543180816 in words is "thirty-one billion, five hundred forty-three million, one hundred eighty thousand, eight hundred sixteen".