51042385 has 4 divisors (see below), whose sum is σ = 61250868. Its totient is φ = 40833904.

The previous prime is 51042373. The next prime is 51042457. The reversal of 51042385 is 58324015.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24920064 + 26122321 = 4992^2 + 5111^2 .

It is a cyclic number.

It is not a de Polignac number, because 51042385 - 2²³ = 42653777 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 3 ways as a sum of consecutive naturals, for example, 5104234 + ... + 5104243.

It is an arithmetic number, because the mean of its divisors is an integer number (15312717).

Almost surely, 2^51042385 is an apocalyptic number.

It is an amenable number.

51042385 is a deficient number, since it is larger than the sum of its proper divisors (10208483).

51042385 is a wasteful number, since it uses less digits than its factorization.

51042385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10208482.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 51042385 is about 7144.3953558016. The cubic root of 51042385 is about 370.9456816798.

The spelling of 51042385 in words is "fifty-one million, forty-two thousand, three hundred eighty-five".