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138751 = 891559
BaseRepresentation
bin100001110111111111
321001022221
4201313333
513420001
62550211
71115344
oct416777
9231287
10138751
1195278
1268367
134b202
14387cb
152b1a1
hex21dff

138751 has 4 divisors (see below), whose sum is σ = 140400. Its totient is φ = 137104.

The previous prime is 138739. The next prime is 138763. The reversal of 138751 is 157831.

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

It is an interprime number because it is at equal distance from previous prime (138739) and next prime (138763).

It is a cyclic number.

It is not a de Polignac number, because 138751 - 29 = 138239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138731) 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, 691 + ... + 868.

It is an arithmetic number, because the mean of its divisors is an integer number (35100).

2138751 is an apocalyptic number.

138751 is a deficient number, since it is larger than the sum of its proper divisors (1649).

138751 is an equidigital number, since it uses as much as digits as its factorization.

138751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648.

The product of its digits is 840, while the sum is 25.

The square root of 138751 is about 372.4929529535. The cubic root of 138751 is about 51.7700646444.

The spelling of 138751 in words is "one hundred thirty-eight thousand, seven hundred fifty-one".

Divisors: 1 89 1559 138751