51545444 has 12 divisors (see below), whose sum is σ = 90663804. Its totient is φ = 25641504.

The previous prime is 51545443. The next prime is 51545449. The reversal of 51545444 is 44454515.

It can be written as a sum of positive squares in 2 ways, for example, as 35545444 + 16000000 = 5962^2 + 4000^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51545444.

It is not an unprimeable number, because it can be changed into a prime (51545443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31919 + ... + 33494.

It is an arithmetic number, because the mean of its divisors is an integer number (7555317).

Almost surely, 2^51545444 is an apocalyptic number.

It is an amenable number.

51545444 is a deficient number, since it is larger than the sum of its proper divisors (39118360).

51545444 is a wasteful number, since it uses less digits than its factorization.

51545444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65614 (or 65612 counting only the distinct ones).

The product of its digits is 32000, while the sum is 32.

The square root of 51545444 is about 7179.5155825445. The cubic root of 51545444 is about 372.1603444116.

Adding to 51545444 its reverse (44454515), we get a palindrome (95999959).

The spelling of 51545444 in words is "fifty-one million, five hundred forty-five thousand, four hundred forty-four".