51538731 has 8 divisors (see below), whose sum is σ = 69588480. Its totient is φ = 33924072.

The previous prime is 51538727. The next prime is 51538741. The reversal of 51538731 is 13783515.

51538731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51538731 - 2² = 51538727 is a prime.

It is a super-4 number, since 4×51538731⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 51538692 and 51538701.

It is not an unprimeable number, because it can be changed into a prime (51538741) 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, 108495 + ... + 108968.

It is an arithmetic number, because the mean of its divisors is an integer number (8698560).

Almost surely, 2^51538731 is an apocalyptic number.

51538731 is a deficient number, since it is larger than the sum of its proper divisors (18049749).

51538731 is a wasteful number, since it uses less digits than its factorization.

51538731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217545.

The product of its digits is 12600, while the sum is 33.

The square root of 51538731 is about 7179.0480566716. The cubic root of 51538731 is about 372.1441876596.

The spelling of 51538731 in words is "fifty-one million, five hundred thirty-eight thousand, seven hundred thirty-one".