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51630281 = 371395413
BaseRepresentation
bin1100010011110…
…1000011001001
310121011002102122
43010331003021
5101204132111
65042341025
71164564413
oct304750311
9117132378
1051630281
112716465a
121535a775
13a909481
146bdd9b3
1547eccdb
hex313d0c9

51630281 has 4 divisors (see below), whose sum is σ = 53025732. Its totient is φ = 50234832.

The previous prime is 51630269. The next prime is 51630301. The reversal of 51630281 is 18203615.

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 25200400 + 26429881 = 5020^2 + 5141^2 .

It is a cyclic number.

It is not a de Polignac number, because 51630281 - 210 = 51629257 is a prime.

It is a super-2 number, since 2×516302812 = 5331371832277922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51630281.

It is not an unprimeable number, because it can be changed into a prime (51630211) 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, 697670 + ... + 697743.

It is an arithmetic number, because the mean of its divisors is an integer number (13256433).

Almost surely, 251630281 is an apocalyptic number.

It is an amenable number.

51630281 is a deficient number, since it is larger than the sum of its proper divisors (1395451).

51630281 is a wasteful number, since it uses less digits than its factorization.

51630281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395450.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 51630281 is about 7185.4214211833. The cubic root of 51630281 is about 372.3644081067.

Adding to 51630281 its reverse (18203615), we get a palindrome (69833896).

The spelling of 51630281 in words is "fifty-one million, six hundred thirty thousand, two hundred eighty-one".

Divisors: 1 37 1395413 51630281