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2117281 = 41113457
BaseRepresentation
bin1000000100111010100001
310222120100211
420010322201
51020223111
6113214121
723665555
oct10047241
93876324
102117281
111216821
12861341
1359193a
143d1865
152bc521
hex204ea1

2117281 has 8 divisors (see below), whose sum is σ = 2192904. Its totient is φ = 2042880.

The previous prime is 2117273. The next prime is 2117287. The reversal of 2117281 is 1827112.

It can be written as a sum of positive squares in 4 ways, for example, as 256 + 2117025 = 16^2 + 1455^2 .

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 2117281 - 23 = 2117273 is a prime.

It is a super-2 number, since 2×21172812 = 8965757665922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2117287) 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, 4405 + ... + 4861.

It is an arithmetic number, because the mean of its divisors is an integer number (274113).

22117281 is an apocalyptic number.

It is an amenable number.

2117281 is a deficient number, since it is larger than the sum of its proper divisors (75623).

2117281 is a wasteful number, since it uses less digits than its factorization.

2117281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611.

The product of its digits is 224, while the sum is 22.

The square root of 2117281 is about 1455.0879698492. The cubic root of 2117281 is about 128.4082222521.

The spelling of 2117281 in words is "two million, one hundred seventeen thousand, two hundred eighty-one".

Divisors: 1 41 113 457 4633 18737 51641 2117281