Search a number
-
+
249247 = 281887
BaseRepresentation
bin111100110110011111
3110122220101
4330312133
530433442
65201531
72055445
oct746637
9418811
10249247
11160299
121002a7
13895ab
1466b95
154dcb7
hex3cd9f

249247 has 4 divisors (see below), whose sum is σ = 250416. Its totient is φ = 248080.

The previous prime is 249233. The next prime is 249253. The reversal of 249247 is 742942.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 742942 = 2371471.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-249247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249217) 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, 163 + ... + 724.

It is an arithmetic number, because the mean of its divisors is an integer number (62604).

2249247 is an apocalyptic number.

249247 is a deficient number, since it is larger than the sum of its proper divisors (1169).

249247 is an equidigital number, since it uses as much as digits as its factorization.

249247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168.

The product of its digits is 4032, while the sum is 28.

The square root of 249247 is about 499.2464321355. The cubic root of 249247 is about 62.9327408505.

It can be divided in two parts, 249 and 247, that added together give a triangular number (496 = T31).

The spelling of 249247 in words is "two hundred forty-nine thousand, two hundred forty-seven".

Divisors: 1 281 887 249247