51271644 has 24 divisors (see below), whose sum is σ = 123493888. Its totient is φ = 16539120.

The previous prime is 51271639. The next prime is 51271657. The reversal of 51271644 is 44617215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68542 + ... + 69285.

Almost surely, 2^51271644 is an apocalyptic number.

It is an amenable number.

51271644 is an abundant number, since it is smaller than the sum of its proper divisors (72222244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51271644 is a wasteful number, since it uses less digits than its factorization.

51271644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137865 (or 137863 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 51271644 is about 7160.4220545999. The cubic root of 51271644 is about 371.5002249195.

Adding to 51271644 its reverse (44617215), we get a palindrome (95888859).

It can be divided in two parts, 51271 and 644, that added together give a palindrome (51915).

The spelling of 51271644 in words is "fifty-one million, two hundred seventy-one thousand, six hundred forty-four".