51445550 has 24 divisors (see below), whose sum is σ = 103050696. Its totient is φ = 18995040.

The previous prime is 51445531. The next prime is 51445561. The reversal of 51445550 is 5554415.

It is a happy number.

It is a super-2 number, since 2×51445550² = 5293289229605000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38924 + ... + 40223.

It is an arithmetic number, because the mean of its divisors is an integer number (4293779).

Almost surely, 2^51445550 is an apocalyptic number.

51445550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51445550 is an abundant number, since it is smaller than the sum of its proper divisors (51605146).

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

51445550 is a wasteful number, since it uses less digits than its factorization.

51445550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79172 (or 79167 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 51445550 is about 7172.5553326552. Note that the first 3 decimals coincide. The cubic root of 51445550 is about 371.9197759328.

Adding to 51445550 its reverse (5554415), we get a palindrome (56999965).

It can be divided in two parts, 514 and 45550, that added together give a palindrome (46064).

The spelling of 51445550 in words is "fifty-one million, four hundred forty-five thousand, five hundred fifty".