31748782748811 has 4 divisors (see below), whose sum is σ = 42331710331752. Its totient is φ = 21165855165872.

The previous prime is 31748782748807. The next prime is 31748782748819. The reversal of 31748782748811 is 11884728784713.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31748782748811 - 2² = 31748782748807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31748782748819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5291463791466 + ... + 5291463791471.

It is an arithmetic number, because the mean of its divisors is an integer number (10582927582938).

Almost surely, 2^{31748782748811} is an apocalyptic number.

31748782748811 is a deficient number, since it is larger than the sum of its proper divisors (10582927582941).

31748782748811 is a wasteful number, since it uses less digits than its factorization.

31748782748811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10582927582940.

The product of its digits is 134873088, while the sum is 69.

The spelling of 31748782748811 in words is "thirty-one trillion, seven hundred forty-eight billion, seven hundred eighty-two million, seven hundred forty-eight thousand, eight hundred eleven".