51383905 has 8 divisors (see below), whose sum is σ = 62111592. Its totient is φ = 40806528.

The previous prime is 51383903. The next prime is 51383921. The reversal of 51383905 is 50938315.

It can be written as a sum of positive squares in 4 ways, for example, as 20214016 + 31169889 = 4496^2 + 5583^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51383905 - 2¹ = 51383903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51383903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36822 + ... + 38191.

It is an arithmetic number, because the mean of its divisors is an integer number (7763949).

Almost surely, 2^51383905 is an apocalyptic number.

It is an amenable number.

51383905 is a deficient number, since it is larger than the sum of its proper divisors (10727687).

51383905 is a wasteful number, since it uses less digits than its factorization.

51383905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75155.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 51383905 is about 7168.2567615844. The cubic root of 51383905 is about 371.7711647107.

The spelling of 51383905 in words is "fifty-one million, three hundred eighty-three thousand, nine hundred five".