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208871157 = 31123332713
BaseRepresentation
bin11000111001100…
…01111011110101
3112120000202100210
430130301323311
5411432334112
632420500033
75114242545
oct1434617365
9476022323
10208871157
11a79a1aa0
1259b4a619
1334372101
141da51325
151350cb3c
hexc731ef5

208871157 has 16 divisors (see below), whose sum is σ = 304054848. Its totient is φ = 126487680.

The previous prime is 208871147. The next prime is 208871183. The reversal of 208871157 is 751178802.

It is not a de Polignac number, because 208871157 - 210 = 208870133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208871147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75633 + ... + 78345.

It is an arithmetic number, because the mean of its divisors is an integer number (19003428).

Almost surely, 2208871157 is an apocalyptic number.

It is an amenable number.

208871157 is a deficient number, since it is larger than the sum of its proper divisors (95183691).

208871157 is a wasteful number, since it uses less digits than its factorization.

208871157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5060.

The product of its (nonzero) digits is 31360, while the sum is 39.

The square root of 208871157 is about 14452.3754794843. The cubic root of 208871157 is about 593.3252407753.

The spelling of 208871157 in words is "two hundred eight million, eight hundred seventy-one thousand, one hundred fifty-seven".

Divisors: 1 3 11 33 2333 2713 6999 8139 25663 29843 76989 89529 6329429 18988287 69623719 208871157