Search a number
-
+
139081 = 236047
BaseRepresentation
bin100001111101001001
321001210011
4201331021
513422311
62551521
71116325
oct417511
9231704
10139081
1195548
12685a1
134b3c7
1438985
152b321
hex21f49

139081 has 4 divisors (see below), whose sum is σ = 145152. Its totient is φ = 133012.

The previous prime is 139079. The next prime is 139091. The reversal of 139081 is 180931.

139081 = T303 + T304 + T305.

139081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 139081 - 21 = 139079 is a prime.

It is a super-2 number, since 2×1390812 = 38687049122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139021) 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, 3001 + ... + 3046.

It is an arithmetic number, because the mean of its divisors is an integer number (36288).

2139081 is an apocalyptic number.

139081 is the 305-th centered triangular number.

It is an amenable number.

139081 is a deficient number, since it is larger than the sum of its proper divisors (6071).

139081 is an equidigital number, since it uses as much as digits as its factorization.

139081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6070.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 139081 is about 372.9356512858. The cubic root of 139081 is about 51.8110747875.

The spelling of 139081 in words is "one hundred thirty-nine thousand, eighty-one".

Divisors: 1 23 6047 139081