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2287681 = 11207971
BaseRepresentation
bin1000101110100001000001
311022020002221
420232201001
51041201211
6121011041
725305424
oct10564101
94266087
102287681
111322850
12923a81
13621376
144379bb
15302c71
hex22e841

2287681 has 4 divisors (see below), whose sum is σ = 2495664. Its totient is φ = 2079700.

The previous prime is 2287679. The next prime is 2287687. The reversal of 2287681 is 1867822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2287681 - 21 = 2287679 is a prime.

It is a super-2 number, since 2×22876812 = 10466968715522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2287687) 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, 103975 + ... + 103996.

It is an arithmetic number, because the mean of its divisors is an integer number (623916).

22287681 is an apocalyptic number.

It is an amenable number.

2287681 is a deficient number, since it is larger than the sum of its proper divisors (207983).

2287681 is a wasteful number, since it uses less digits than its factorization.

2287681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207982.

The product of its digits is 10752, while the sum is 34.

The square root of 2287681 is about 1512.5081817961. The cubic root of 2287681 is about 131.7645212496.

The spelling of 2287681 in words is "two million, two hundred eighty-seven thousand, six hundred eighty-one".

Divisors: 1 11 207971 2287681