51081263 has 4 divisors (see below), whose sum is σ = 51108840. Its totient is φ = 51053688.

The previous prime is 51081259. The next prime is 51081281. The reversal of 51081263 is 36218015.

51081263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 51081263 - 2² = 51081259 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 (51086263) 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 3 ways as a sum of consecutive naturals, for example, 10793 + ... + 14786.

It is an arithmetic number, because the mean of its divisors is an integer number (12777210).

Almost surely, 2^51081263 is an apocalyptic number.

51081263 is a deficient number, since it is larger than the sum of its proper divisors (27577).

51081263 is a wasteful number, since it uses less digits than its factorization.

51081263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27576.

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

The square root of 51081263 is about 7147.1157119498. The cubic root of 51081263 is about 371.0398385013.

Adding to 51081263 its reverse (36218015), we get a palindrome (87299278).

The spelling of 51081263 in words is "fifty-one million, eighty-one thousand, two hundred sixty-three".