51382939 has 4 divisors (see below), whose sum is σ = 51398424. Its totient is φ = 51367456.

The previous prime is 51382909. The next prime is 51382949. The reversal of 51382939 is 93928315.

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

It is a cyclic number.

It is not a de Polignac number, because 51382939 - 2⁵ = 51382907 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51382909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517 + ... + 10150.

It is an arithmetic number, because the mean of its divisors is an integer number (12849606).

Almost surely, 2^51382939 is an apocalyptic number.

51382939 is a deficient number, since it is larger than the sum of its proper divisors (15485).

51382939 is a wasteful number, since it uses less digits than its factorization.

51382939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15484.

The product of its digits is 58320, while the sum is 40.

The square root of 51382939 is about 7168.1893808688. The cubic root of 51382939 is about 371.7688349722.

The spelling of 51382939 in words is "fifty-one million, three hundred eighty-two thousand, nine hundred thirty-nine".