51396239 has 4 divisors (see below), whose sum is σ = 52489824. Its totient is φ = 50302656.

The previous prime is 51396229. The next prime is 51396263. The reversal of 51396239 is 93269315.

51396239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93269315 = 5 ⋅18653863.

It is a cyclic number.

It is not a de Polignac number, because 51396239 - 2⁸ = 51395983 is a prime.

It is a super-3 number, since 3×51396239³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51396229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546722 + ... + 546815.

It is an arithmetic number, because the mean of its divisors is an integer number (13122456).

Almost surely, 2^51396239 is an apocalyptic number.

51396239 is a deficient number, since it is larger than the sum of its proper divisors (1093585).

51396239 is a wasteful number, since it uses less digits than its factorization.

51396239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093584.

The product of its digits is 43740, while the sum is 38.

The square root of 51396239 is about 7169.1170307089. The cubic root of 51396239 is about 371.8009085167.

The spelling of 51396239 in words is "fifty-one million, three hundred ninety-six thousand, two hundred thirty-nine".