51551444 has 24 divisors (see below), whose sum is σ = 106659840. Its totient is φ = 21331296.

The previous prime is 51551443. The next prime is 51551449. The reversal of 51551444 is 44415515.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51551443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30932 + ... + 32555.

It is an arithmetic number, because the mean of its divisors is an integer number (4444160).

Almost surely, 2^51551444 is an apocalyptic number.

It is an amenable number.

51551444 is an abundant number, since it is smaller than the sum of its proper divisors (55108396).

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

51551444 is a wasteful number, since it uses less digits than its factorization.

51551444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63527 (or 63525 counting only the distinct ones).

The product of its digits is 8000, while the sum is 29.

The square root of 51551444 is about 7179.9334258752. The cubic root of 51551444 is about 372.1747839382.

Adding to 51551444 its reverse (44415515), we get a palindrome (95966959).

The spelling of 51551444 in words is "fifty-one million, five hundred fifty-one thousand, four hundred forty-four".