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108638137 = 577188281
BaseRepresentation
bin1100111100110…
…10111110111001
321120102101111201
412132122332321
5210302410022
614440254201
72456260156
oct636327671
9246371451
10108638137
1156361493
1230471361
131967952a
14105dd22d
15980e127
hex679afb9

108638137 has 4 divisors (see below), whose sum is σ = 108826996. Its totient is φ = 108449280.

The previous prime is 108638129. The next prime is 108638141. The reversal of 108638137 is 731836801.

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 99420841 + 9217296 = 9971^2 + 3036^2 .

It is a cyclic number.

It is not a de Polignac number, because 108638137 - 23 = 108638129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 108638096 and 108638105.

It is not an unprimeable number, because it can be changed into a prime (108638107) 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, 93564 + ... + 94717.

It is an arithmetic number, because the mean of its divisors is an integer number (27206749).

Almost surely, 2108638137 is an apocalyptic number.

It is an amenable number.

108638137 is a deficient number, since it is larger than the sum of its proper divisors (188859).

108638137 is an equidigital number, since it uses as much as digits as its factorization.

108638137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188858.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 108638137 is about 10422.9620070304. The cubic root of 108638137 is about 477.1564181334.

The spelling of 108638137 in words is "one hundred eight million, six hundred thirty-eight thousand, one hundred thirty-seven".

Divisors: 1 577 188281 108638137