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51965 = 519547
BaseRepresentation
bin1100101011111101
32122021122
430223331
53130330
61040325
7304334
oct145375
978248
1051965
1136051
12260a5
131a864
1414d1b
15105e5
hexcafd

51965 has 8 divisors (see below), whose sum is σ = 65760. Its totient is φ = 39312.

The previous prime is 51949. The next prime is 51971. The reversal of 51965 is 56915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51965 - 24 = 51949 is a prime.

It is a super-2 number, since 2×519652 = 5400722450, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 51965.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179 + ... + 368.

It is an arithmetic number, because the mean of its divisors is an integer number (8220).

251965 is an apocalyptic number.

It is an amenable number.

51965 is a deficient number, since it is larger than the sum of its proper divisors (13795).

51965 is a wasteful number, since it uses less digits than its factorization.

51965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571.

The product of its digits is 1350, while the sum is 26.

The square root of 51965 is about 227.9583295254. The cubic root of 51965 is about 37.3167354649.

Subtracting 51965 from its reverse (56915), we obtain a triangular number (4950 = T99).

The spelling of 51965 in words is "fifty-one thousand, nine hundred sixty-five".

Divisors: 1 5 19 95 547 2735 10393 51965