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81337 = 163499
BaseRepresentation
bin10011110110111001
311010120111
4103312321
510100322
61424321
7456064
oct236671
9133514
1081337
1156123
123b0a1
132b039
14218db
1519177
hex13db9

81337 has 4 divisors (see below), whose sum is σ = 82000. Its totient is φ = 80676.

The previous prime is 81331. The next prime is 81343. The reversal of 81337 is 73318.

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, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (81331) and next prime (81343).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-81337 is a prime.

It is a Duffinian number.

81337 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (81331) 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, 87 + ... + 412.

It is an arithmetic number, because the mean of its divisors is an integer number (20500).

281337 is an apocalyptic number.

It is an amenable number.

81337 is a deficient number, since it is larger than the sum of its proper divisors (663).

81337 is a wasteful number, since it uses less digits than its factorization.

81337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662.

The product of its digits is 504, while the sum is 22.

The square root of 81337 is about 285.1964235400. The cubic root of 81337 is about 43.3274087890.

The spelling of 81337 in words is "eighty-one thousand, three hundred thirty-seven".

Divisors: 1 163 499 81337