51286739 has 8 divisors (see below), whose sum is σ = 62061408. Its totient is φ = 41374080.

The previous prime is 51286727. The next prime is 51286751. The reversal of 51286739 is 93768215.

51286739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51286727) and next prime (51286751).

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 51286739 - 2⁴ = 51286723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51286696 and 51286705.

It is not an unprimeable number, because it can be changed into a prime (51286799) 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 7 ways as a sum of consecutive naturals, for example, 215372 + ... + 215609.

It is an arithmetic number, because the mean of its divisors is an integer number (7757676).

Almost surely, 2^51286739 is an apocalyptic number.

51286739 is a deficient number, since it is larger than the sum of its proper divisors (10774669).

51286739 is a wasteful number, since it uses less digits than its factorization.

51286739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431005.

The product of its digits is 90720, while the sum is 41.

The square root of 51286739 is about 7161.4760350084. The cubic root of 51286739 is about 371.5366794144.

It can be divided in two parts, 51286 and 739, that added together give a palindrome (52025).

The spelling of 51286739 in words is "fifty-one million, two hundred eighty-six thousand, seven hundred thirty-nine".