31261050065543 has 4 divisors (see below), whose sum is σ = 31289546921760. Its totient is φ = 31232553209328.

The previous prime is 31261050065537. The next prime is 31261050065569. The reversal of 31261050065543 is 34556005016213.

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 31261050065543 - 2²⁸ = 31260781630087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31261050065543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31261050065573) 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, 14248426463 + ... + 14248428656.

It is an arithmetic number, because the mean of its divisors is an integer number (7822386730440).

Almost surely, 2^{31261050065543} is an apocalyptic number.

31261050065543 is a deficient number, since it is larger than the sum of its proper divisors (28496856217).

31261050065543 is a wasteful number, since it uses less digits than its factorization.

31261050065543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28496856216.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 31261050065543 in words is "thirty-one trillion, two hundred sixty-one billion, fifty million, sixty-five thousand, five hundred forty-three".