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82139009 = 787310433
BaseRepresentation
bin1001110010101…
…01011110000001
312201120002112112
410321111132001
5132011422014
612052305105
72015112221
oct471253601
9181502475
1082139009
1142402287
1223612195
131402bb84
14aca2081
15732773e
hex4e55781

82139009 has 4 divisors (see below), whose sum is σ = 82157316. Its totient is φ = 82120704.

The previous prime is 82138993. The next prime is 82139011. The reversal of 82139009 is 90093128.

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 22771984 + 59367025 = 4772^2 + 7705^2 .

It is a cyclic number.

It is not a de Polignac number, because 82139009 - 24 = 82138993 is a prime.

It is a super-3 number, since 3×821390093 (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82139039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2657 + ... + 13089.

It is an arithmetic number, because the mean of its divisors is an integer number (20539329).

Almost surely, 282139009 is an apocalyptic number.

It is an amenable number.

82139009 is a deficient number, since it is larger than the sum of its proper divisors (18307).

82139009 is a wasteful number, since it uses less digits than its factorization.

82139009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18306.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 82139009 is about 9063.0573759631. The cubic root of 82139009 is about 434.6935067416.

The spelling of 82139009 in words is "eighty-two million, one hundred thirty-nine thousand, nine".

Divisors: 1 7873 10433 82139009