51047831 has 4 divisors (see below), whose sum is σ = 51123912. Its totient is φ = 50971752.

The previous prime is 51047807. The next prime is 51047849. The reversal of 51047831 is 13874015.

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 51047831 - 2¹⁴ = 51031447 is a prime.

It is a super-2 number, since 2×51047831² = 5211762099609122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51047794 and 51047803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51047891) 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, 37025 + ... + 38378.

It is an arithmetic number, because the mean of its divisors is an integer number (12780978).

Almost surely, 2^51047831 is an apocalyptic number.

51047831 is a deficient number, since it is larger than the sum of its proper divisors (76081).

51047831 is an equidigital number, since it uses as much as digits as its factorization.

51047831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76080.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 51047831 is about 7144.7764835578. The cubic root of 51047831 is about 370.9588739731.

The spelling of 51047831 in words is "fifty-one million, forty-seven thousand, eight hundred thirty-one".