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51808087 = 500910343
BaseRepresentation
bin1100010110100…
…0011101010111
310121111010100001
43011220131113
5101230324322
65050232131
71166234662
oct305503527
9117433301
1051808087
1127276201
1215425647
13a96c396
146c486d9
154835827
hex3168757

51808087 has 4 divisors (see below), whose sum is σ = 51823440. Its totient is φ = 51792736.

The previous prime is 51808069. The next prime is 51808091. The reversal of 51808087 is 78080815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78080815 = 515616163.

It is a cyclic number.

It is not a de Polignac number, because 51808087 - 211 = 51806039 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 (51808067) 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, 163 + ... + 10180.

It is an arithmetic number, because the mean of its divisors is an integer number (12955860).

Almost surely, 251808087 is an apocalyptic number.

51808087 is a deficient number, since it is larger than the sum of its proper divisors (15353).

51808087 is a wasteful number, since it uses less digits than its factorization.

51808087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15352.

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 51808087 is about 7197.7834782661. The cubic root of 51808087 is about 372.7913718055.

It can be divided in two parts, 5180808 and 7, that added together give a palindrome (5180815).

The spelling of 51808087 in words is "fifty-one million, eight hundred eight thousand, eighty-seven".

Divisors: 1 5009 10343 51808087