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2287231 = 17831621
BaseRepresentation
bin1000101110011001111111
311022012111021
420232121333
51041142411
6121005011
725304212
oct10563177
94265437
102287231
111322481
12923767
136210bb
14437779
15302a71
hex22e67f

2287231 has 8 divisors (see below), whose sum is σ = 2452464. Its totient is φ = 2125440.

The previous prime is 2287223. The next prime is 2287237. The reversal of 2287231 is 1327822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2287231 - 23 = 2287223 is a prime.

It is a super-2 number, since 2×22872312 = 10462851294722, which contains 22 as substring.

It is a Duffinian number.

2287231 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2287196 and 2287205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2287237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 601 + ... + 2221.

It is an arithmetic number, because the mean of its divisors is an integer number (306558).

It is the magic constant of a 166 × 166 magic square.

22287231 is an apocalyptic number.

2287231 is the 957-th centered pentagonal number.

2287231 is a deficient number, since it is larger than the sum of its proper divisors (165233).

2287231 is a wasteful number, since it uses less digits than its factorization.

2287231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721.

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

The square root of 2287231 is about 1512.3594149540. The cubic root of 2287231 is about 131.7558810702.

The spelling of 2287231 in words is "two million, two hundred eighty-seven thousand, two hundred thirty-one".

Divisors: 1 17 83 1411 1621 27557 134543 2287231