51585538 has 4 divisors (see below), whose sum is σ = 77378310. Its totient is φ = 25792768.

The previous prime is 51585487. The next prime is 51585539. The reversal of 51585538 is 83558515.

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., 43784689 + 7800849 = 6617^2 + 2793^2 .

It is a super-2 number, since 2×51585538² = 5322135461498888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51585538.

It is not an unprimeable number, because it can be changed into a prime (51585539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12896383 + ... + 12896386.

Almost surely, 2^51585538 is an apocalyptic number.

51585538 is a deficient number, since it is larger than the sum of its proper divisors (25792772).

51585538 is a wasteful number, since it uses less digits than its factorization.

51585538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25792771.

The product of its digits is 120000, while the sum is 40.

The square root of 51585538 is about 7182.3072894440. The cubic root of 51585538 is about 372.2568128774.

The spelling of 51585538 in words is "fifty-one million, five hundred eighty-five thousand, five hundred thirty-eight".