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731081 = 1356237
BaseRepresentation
bin10110010011111001001
31101010212002
42302133021
5141343311
623400345
76133301
oct2623711
91333762
10731081
1145a2aa
122b30b5
131c79c0
14150601
15e693b
hexb27c9

731081 has 4 divisors (see below), whose sum is σ = 787332. Its totient is φ = 674832.

The previous prime is 731057. The next prime is 731113. The reversal of 731081 is 180137.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 241081 + 490000 = 491^2 + 700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-731081 is a prime.

It is a super-2 number, since 2×7310812 = 1068958857122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (731041) 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, 28106 + ... + 28131.

It is an arithmetic number, because the mean of its divisors is an integer number (196833).

2731081 is an apocalyptic number.

It is an amenable number.

731081 is a deficient number, since it is larger than the sum of its proper divisors (56251).

731081 is a wasteful number, since it uses less digits than its factorization.

731081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56250.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 731081 is about 855.0327479109. The cubic root of 731081 is about 90.0855565019.

The spelling of 731081 in words is "seven hundred thirty-one thousand, eighty-one".

Divisors: 1 13 56237 731081