51081511 has 8 divisors (see below), whose sum is σ = 55546400. Its totient is φ = 46693152.

The previous prime is 51081493. The next prime is 51081517. The reversal of 51081511 is 11518015.

51081511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51081511 - 2¹¹ = 51079463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51081517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17736 + ... + 20413.

It is an arithmetic number, because the mean of its divisors is an integer number (6943300).

Almost surely, 2^51081511 is an apocalyptic number.

51081511 is a deficient number, since it is larger than the sum of its proper divisors (4464889).

51081511 is a wasteful number, since it uses less digits than its factorization.

51081511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38265.

The product of its (nonzero) digits is 200, while the sum is 22.

The square root of 51081511 is about 7147.1330615849. The cubic root of 51081511 is about 371.0404389676.

Adding to 51081511 its reverse (11518015), we get a palindrome (62599526).

The spelling of 51081511 in words is "fifty-one million, eighty-one thousand, five hundred eleven".