51490839 has 4 divisors (see below), whose sum is σ = 68654456. Its totient is φ = 34327224.

The previous prime is 51490811. The next prime is 51490843. The reversal of 51490839 is 93809415.

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

It is not a de Polignac number, because 51490839 - 2¹¹ = 51488791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51490797 and 51490806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51490139) by changing a digit.

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, 8581804 + ... + 8581809.

It is an arithmetic number, because the mean of its divisors is an integer number (17163614).

Almost surely, 2^51490839 is an apocalyptic number.

51490839 is a deficient number, since it is larger than the sum of its proper divisors (17163617).

51490839 is a wasteful number, since it uses less digits than its factorization.

51490839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17163616.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 51490839 is about 7175.7117417020. The cubic root of 51490839 is about 372.0288811546.

The spelling of 51490839 in words is "fifty-one million, four hundred ninety thousand, eight hundred thirty-nine".