248731 has 4 divisors (see below), whose sum is σ = 284272. Its totient is φ = 213192.

The previous prime is 248723. The next prime is 248737. The reversal of 248731 is 137842.

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

It is not a de Polignac number, because 248731 - 2³ = 248723 is a prime.

It is a super-2 number, since 2×248731² = 123734220722, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹⁵ + 4⁸ + 7⁶ + 8⁵ + 3² + 1 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 248696 and 248705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (248737) 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, 17760 + ... + 17773.

It is an arithmetic number, because the mean of its divisors is an integer number (71068).

2²⁴⁸⁷³¹ is an apocalyptic number.

248731 is a deficient number, since it is larger than the sum of its proper divisors (35541).

248731 is an equidigital number, since it uses as much as digits as its factorization.

248731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35540.

The product of its digits is 1344, while the sum is 25.

The square root of 248731 is about 498.7293855389. The cubic root of 248731 is about 62.8892823145.

Subtracting from 248731 its reverse (137842), we obtain a square (110889 = 333²).

It can be divided in two parts, 248 and 731, that added together give a palindrome (979).

The spelling of 248731 in words is "two hundred forty-eight thousand, seven hundred thirty-one".