31281646343 has 4 divisors (see below), whose sum is σ = 31421923008. Its totient is φ = 31141369680.

The previous prime is 31281646327. The next prime is 31281646367. The reversal of 31281646343 is 34364618213.

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 31281646343 - 2⁴ = 31281646327 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 31281646343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31281646843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70137998 + ... + 70138443.

It is an arithmetic number, because the mean of its divisors is an integer number (7855480752).

Almost surely, 2^31281646343 is an apocalyptic number.

31281646343 is a deficient number, since it is larger than the sum of its proper divisors (140276665).

31281646343 is a wasteful number, since it uses less digits than its factorization.

31281646343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140276664.

The product of its digits is 248832, while the sum is 41.

The spelling of 31281646343 in words is "thirty-one billion, two hundred eighty-one million, six hundred forty-six thousand, three hundred forty-three".