51000831 has 24 divisors (see below), whose sum is σ = 84389760. Its totient is φ = 29074896.

The previous prime is 51000751. The next prime is 51000841. The reversal of 51000831 is 13800015.

It is a happy number.

It is not a de Polignac number, because 51000831 - 2¹⁰ = 50999807 is a prime.

It is a super-2 number, since 2×51000831² = 5202169525381122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39880 + ... + 41138.

It is an arithmetic number, because the mean of its divisors is an integer number (3516240).

Almost surely, 2^51000831 is an apocalyptic number.

51000831 is a deficient number, since it is larger than the sum of its proper divisors (33388929).

51000831 is a wasteful number, since it uses less digits than its factorization.

51000831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915 (or 1912 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 51000831 is about 7141.4866099433. The cubic root of 51000831 is about 370.8449911020.

Adding to 51000831 its reverse (13800015), we get a palindrome (64800846).

The spelling of 51000831 in words is "fifty-one million, eight hundred thirty-one", and thus it is an aban number.