51138841 has 8 divisors (see below), whose sum is σ = 55133120. Its totient is φ = 47153232.

The previous prime is 51138733. The next prime is 51138851. The reversal of 51138841 is 14883115.

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 51138841 - 2⁷ = 51138713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51138851) 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, 15430 + ... + 18448.

It is an arithmetic number, because the mean of its divisors is an integer number (6891640).

Almost surely, 2^51138841 is an apocalyptic number.

It is an amenable number.

51138841 is a deficient number, since it is larger than the sum of its proper divisors (3994279).

51138841 is a wasteful number, since it uses less digits than its factorization.

51138841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4335.

The product of its digits is 3840, while the sum is 31.

The square root of 51138841 is about 7151.1426359708. The cubic root of 51138841 is about 371.1791962530.

The spelling of 51138841 in words is "fifty-one million, one hundred thirty-eight thousand, eight hundred forty-one".