51109243831 has 2 divisors, whose sum is σ = 51109243832. Its totient is φ = 51109243830.

The previous prime is 51109243813. The next prime is 51109243891. The reversal of 51109243831 is 13834290115.

Together with previous prime (51109243813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51109243831 - 2⁵ = 51109243799 is a prime.

It is a super-2 number, since 2×51109243831² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51109243811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25554621915 + 25554621916.

It is an arithmetic number, because the mean of its divisors is an integer number (25554621916).

Almost surely, 2^51109243831 is an apocalyptic number.

51109243831 is a deficient number, since it is larger than the sum of its proper divisors (1).

51109243831 is an equidigital number, since it uses as much as digits as its factorization.

51109243831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 51109243831 in words is "fifty-one billion, one hundred nine million, two hundred forty-three thousand, eight hundred thirty-one".