247931 has 4 divisors (see below), whose sum is σ = 261000. Its totient is φ = 234864.

The previous prime is 247913. The next prime is 247939. The reversal of 247931 is 139742.

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 247931 - 2¹⁰ = 246907 is a prime.

It is a super-2 number, since 2×247931² = 122939561522, which contains 22 as substring.

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 247931.

It is not an unprimeable number, because it can be changed into a prime (247939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6506 + ... + 6543.

It is an arithmetic number, because the mean of its divisors is an integer number (65250).

2²⁴⁷⁹³¹ is an apocalyptic number.

247931 is a deficient number, since it is larger than the sum of its proper divisors (13069).

247931 is a wasteful number, since it uses less digits than its factorization.

247931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13068.

The product of its digits is 1512, while the sum is 26.

The square root of 247931 is about 497.9267014331. The cubic root of 247931 is about 62.8217857529.

The spelling of 247931 in words is "two hundred forty-seven thousand, nine hundred thirty-one".