31017540643 has 4 divisors (see below), whose sum is σ = 32087111040. Its totient is φ = 29947970248.

The previous prime is 31017540607. The next prime is 31017540661. The reversal of 31017540643 is 34604571013.

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 31017540643 - 2⁹ = 31017540131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31017540599 and 31017540608.

It is not an unprimeable number, because it can be changed into a prime (31017544643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534785155 + ... + 534785212.

It is an arithmetic number, because the mean of its divisors is an integer number (8021777760).

Almost surely, 2^31017540643 is an apocalyptic number.

31017540643 is a deficient number, since it is larger than the sum of its proper divisors (1069570397).

31017540643 is a wasteful number, since it uses less digits than its factorization.

31017540643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069570396.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 31017540643 in words is "thirty-one billion, seventeen million, five hundred forty thousand, six hundred forty-three".