51255765 has 48 divisors (see below), whose sum is σ = 102638016. Its totient is φ = 23385600.

The previous prime is 51255739. The next prime is 51255769. The reversal of 51255765 is 56755215.

It is a happy number.

51255765 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 51255765 - 2⁵ = 51255733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51255769) 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 47 ways as a sum of consecutive naturals, for example, 5370 + ... + 11460.

It is an arithmetic number, because the mean of its divisors is an integer number (2138292).

Almost surely, 2^51255765 is an apocalyptic number.

51255765 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51255765 is an abundant number, since it is smaller than the sum of its proper divisors (51382251).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51255765 is a wasteful number, since it uses less digits than its factorization.

51255765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6130 (or 6127 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 51255765 is about 7159.3131653812. The cubic root of 51255765 is about 371.4618693380.

The spelling of 51255765 in words is "fifty-one million, two hundred fifty-five thousand, seven hundred sixty-five".