51438489 has 16 divisors (see below), whose sum is σ = 71137920. Its totient is φ = 33022080.

The previous prime is 51438487. The next prime is 51438493. The reversal of 51438489 is 98483415.

It is not a de Polignac number, because 51438489 - 2¹ = 51438487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51438489.

It is not an unprimeable number, because it can be changed into a prime (51438487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54429 + ... + 55365.

It is an arithmetic number, because the mean of its divisors is an integer number (4446120).

Almost surely, 2^51438489 is an apocalyptic number.

It is an amenable number.

51438489 is a deficient number, since it is larger than the sum of its proper divisors (19699431).

51438489 is a wasteful number, since it uses less digits than its factorization.

51438489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600.

The product of its digits is 138240, while the sum is 42.

The square root of 51438489 is about 7172.0630923048. The cubic root of 51438489 is about 371.9027595877.

The spelling of 51438489 in words is "fifty-one million, four hundred thirty-eight thousand, four hundred eighty-nine".