51489538 has 4 divisors (see below), whose sum is σ = 77234310. Its totient is φ = 25744768.

The previous prime is 51489527. The next prime is 51489539. The reversal of 51489538 is 83598415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34374769 + 17114769 = 5863^2 + 4137^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51489494 and 51489503.

It is not an unprimeable number, because it can be changed into a prime (51489539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12872383 + ... + 12872386.

Almost surely, 2^51489538 is an apocalyptic number.

51489538 is a deficient number, since it is larger than the sum of its proper divisors (25744772).

51489538 is a wasteful number, since it uses less digits than its factorization.

51489538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25744771.

The product of its digits is 172800, while the sum is 43.

The square root of 51489538 is about 7175.6210881010. The cubic root of 51489538 is about 372.0257478228.

The spelling of 51489538 in words is "fifty-one million, four hundred eighty-nine thousand, five hundred thirty-eight".