51438549 has 16 divisors (see below), whose sum is σ = 72811008. Its totient is φ = 32189952.

The previous prime is 51438533. The next prime is 51438551. The reversal of 51438549 is 94583415.

51438549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51438549 - 2⁴ = 51438533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51438589) 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 15 ways as a sum of consecutive naturals, for example, 22204 + ... + 24410.

It is an arithmetic number, because the mean of its divisors is an integer number (4550688).

Almost surely, 2^51438549 is an apocalyptic number.

It is an amenable number.

51438549 is a deficient number, since it is larger than the sum of its proper divisors (21372459).

51438549 is a wasteful number, since it uses less digits than its factorization.

51438549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684.

The product of its digits is 86400, while the sum is 39.

The square root of 51438549 is about 7172.0672752004. The cubic root of 51438549 is about 371.9029041886.

The spelling of 51438549 in words is "fifty-one million, four hundred thirty-eight thousand, five hundred forty-nine".