51040831 has 2 divisors, whose sum is σ = 51040832. Its totient is φ = 51040830.

The previous prime is 51040813. The next prime is 51040853. The reversal of 51040831 is 13804015.

Together with previous prime (51040813) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (51040853) can be obtained adding 51040831 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51040831 - 2⁵ = 51040799 is a prime.

It is a super-2 number, since 2×51040831² = 5210332858341122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51040861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25520415 + 25520416.

It is an arithmetic number, because the mean of its divisors is an integer number (25520416).

Almost surely, 2^51040831 is an apocalyptic number.

51040831 is a deficient number, since it is larger than the sum of its proper divisors (1).

51040831 is an equidigital number, since it uses as much as digits as its factorization.

51040831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 51040831 is about 7144.2865983946. The cubic root of 51040831 is about 370.9419171258.

Adding to 51040831 its reverse (13804015), we get a palindrome (64844846).

The spelling of 51040831 in words is "fifty-one million, forty thousand, eight hundred thirty-one".