51965831 has 4 divisors (see below), whose sum is σ = 52040664. Its totient is φ = 51891000.

The previous prime is 51965791. The next prime is 51965857. The reversal of 51965831 is 13856915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13856915 = 5 ⋅2771383.

It is a cyclic number.

It is not a de Polignac number, because 51965831 - 2¹⁰ = 51964807 is a prime.

It is a super-2 number, since 2×51965831² = 5400895183041122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51965861) 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, 36365 + ... + 37766.

It is an arithmetic number, because the mean of its divisors is an integer number (13010166).

Almost surely, 2^51965831 is an apocalyptic number.

51965831 is a deficient number, since it is larger than the sum of its proper divisors (74833).

51965831 is an equidigital number, since it uses as much as digits as its factorization.

51965831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74832.

The product of its digits is 32400, while the sum is 38.

The square root of 51965831 is about 7208.7329677274. The cubic root of 51965831 is about 373.1693438109.

The spelling of 51965831 in words is "fifty-one million, nine hundred sixty-five thousand, eight hundred thirty-one".