51080831 has 4 divisors (see below), whose sum is σ = 52461432. Its totient is φ = 49700232.

The previous prime is 51080819. The next prime is 51080833. The reversal of 51080831 is 13808015.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51080831 is a prime.

It is a super-2 number, since 2×51080831² = 5218502591301122, 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 51080831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51080833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690245 + ... + 690318.

It is an arithmetic number, because the mean of its divisors is an integer number (13115358).

Almost surely, 2^51080831 is an apocalyptic number.

51080831 is a deficient number, since it is larger than the sum of its proper divisors (1380601).

51080831 is a wasteful number, since it uses less digits than its factorization.

51080831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380600.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 51080831 is about 7147.0854899043. The cubic root of 51080831 is about 371.0387925231.

Adding to 51080831 its reverse (13808015), we get a palindrome (64888846).

The spelling of 51080831 in words is "fifty-one million, eighty thousand, eight hundred thirty-one".