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248531 = 1571583
BaseRepresentation
bin111100101011010011
3110121220212
4330223103
530423111
65154335
72053403
oct745323
9417825
10248531
1115a7a8
12bb9ab
138917a
1466803
154d98b
hex3cad3

248531 has 4 divisors (see below), whose sum is σ = 250272. Its totient is φ = 246792.

The previous prime is 248509. The next prime is 248533. The reversal of 248531 is 135842.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-248531 is a prime.

It is a super-2 number, since 2×2485312 = 123535315922, which contains 22 as substring.

It is a d-powerful number, because it can be written as 217 + 4 + 57 + 85 + 38 + 1 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 248497 and 248506.

It is not an unprimeable number, because it can be changed into a prime (248533) 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, 635 + ... + 948.

It is an arithmetic number, because the mean of its divisors is an integer number (62568).

2248531 is an apocalyptic number.

248531 is a deficient number, since it is larger than the sum of its proper divisors (1741).

248531 is a wasteful number, since it uses less digits than its factorization.

248531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740.

The product of its digits is 960, while the sum is 23.

The square root of 248531 is about 498.5288356755. The cubic root of 248531 is about 62.8724217581.

The spelling of 248531 in words is "two hundred forty-eight thousand, five hundred thirty-one".

Divisors: 1 157 1583 248531