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73081 = 107683
BaseRepresentation
bin10001110101111001
310201020201
4101311321
54314311
61322201
7423031
oct216571
9121221
1073081
114a9a8
1236361
1327358
141c8c1
15169c1
hex11d79

73081 has 4 divisors (see below), whose sum is σ = 73872. Its totient is φ = 72292.

The previous prime is 73079. The next prime is 73091. The reversal of 73081 is 18037.

73081 is nontrivially palindromic in base 14.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18037 = 171061.

It is a cyclic number.

It is not a de Polignac number, because 73081 - 21 = 73079 is a prime.

It is a super-2 number, since 2×730812 = 10681665122, which contains 22 as substring.

It is a Duffinian number.

73081 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (73061) 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, 235 + ... + 448.

It is an arithmetic number, because the mean of its divisors is an integer number (18468).

273081 is an apocalyptic number.

73081 is the 145-th centered heptagonal number.

It is an amenable number.

73081 is a deficient number, since it is larger than the sum of its proper divisors (791).

73081 is a wasteful number, since it uses less digits than its factorization.

73081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 73081 is about 270.3349773892. The cubic root of 73081 is about 41.8088440800.

The spelling of 73081 in words is "seventy-three thousand, eighty-one".

Divisors: 1 107 683 73081