51095781 has 24 divisors (see below), whose sum is σ = 83116800. Its totient is φ = 29966400.

The previous prime is 51095777. The next prime is 51095797. The reversal of 51095781 is 18759015.

51095781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51095781 - 2² = 51095777 is a prime.

It is a super-2 number, since 2×51095781² = 5221557671999922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51095771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5256 + ... + 11393.

It is an arithmetic number, because the mean of its divisors is an integer number (3463200).

Almost surely, 2^51095781 is an apocalyptic number.

It is an amenable number.

51095781 is a deficient number, since it is larger than the sum of its proper divisors (32021019).

51095781 is a wasteful number, since it uses less digits than its factorization.

51095781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16697 (or 16694 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The square root of 51095781 is about 7148.1312942615. The cubic root of 51095781 is about 371.0749867195.

The spelling of 51095781 in words is "fifty-one million, ninety-five thousand, seven hundred eighty-one".