51138535 has 8 divisors (see below), whose sum is σ = 70132896. Its totient is φ = 35066400.

The previous prime is 51138469. The next prime is 51138539. The reversal of 51138535 is 53583115.

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

It is not a de Polignac number, because 51138535 - 2¹¹ = 51136487 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51138497 and 51138506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51138539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 730516 + ... + 730585.

It is an arithmetic number, because the mean of its divisors is an integer number (8766612).

Almost surely, 2^51138535 is an apocalyptic number.

51138535 is a deficient number, since it is larger than the sum of its proper divisors (18994361).

51138535 is a wasteful number, since it uses less digits than its factorization.

51138535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461113.

The product of its digits is 9000, while the sum is 31.

The square root of 51138535 is about 7151.1212407566. The cubic root of 51138535 is about 371.1784559086.

The spelling of 51138535 in words is "fifty-one million, one hundred thirty-eight thousand, five hundred thirty-five".