51065905 has 8 divisors (see below), whose sum is σ = 66849984. Its totient is φ = 37138800.

The previous prime is 51065899. The next prime is 51065933. The reversal of 51065905 is 50956015.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51065905 - 2⁹ = 51065393 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464181 + ... + 464290.

It is an arithmetic number, because the mean of its divisors is an integer number (8356248).

Almost surely, 2^51065905 is an apocalyptic number.

51065905 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51065905 is a deficient number, since it is larger than the sum of its proper divisors (15784079).

51065905 is a wasteful number, since it uses less digits than its factorization.

51065905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928487.

The product of its (nonzero) digits is 6750, while the sum is 31.

The square root of 51065905 is about 7146.0412117479. The cubic root of 51065905 is about 371.0026493854.

It can be divided in two parts, 5106 and 5905, that added together give a palindrome (11011).

The spelling of 51065905 in words is "fifty-one million, sixty-five thousand, nine hundred five".