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51951 = 317317
BaseRepresentation
bin1100101011101111
32122021010
430223233
53130301
61040303
7304314
oct145357
978233
1051951
1136039
1226093
131a853
1414d0b
15105d6
hexcaef

51951 has 4 divisors (see below), whose sum is σ = 69272. Its totient is φ = 34632.

The previous prime is 51949. The next prime is 51971. The reversal of 51951 is 15915.

It is a happy number.

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

It is not a de Polignac number, because 51951 - 21 = 51949 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51941) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8656 + ... + 8661.

It is an arithmetic number, because the mean of its divisors is an integer number (17318).

251951 is an apocalyptic number.

51951 is a deficient number, since it is larger than the sum of its proper divisors (17321).

51951 is a wasteful number, since it uses less digits than its factorization.

51951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17320.

The product of its digits is 225, while the sum is 21.

The square root of 51951 is about 227.9276200902. The cubic root of 51951 is about 37.3133839705.

The spelling of 51951 in words is "fifty-one thousand, nine hundred fifty-one".

Divisors: 1 3 17317 51951