51353550 has 72 divisors (see below), whose sum is σ = 139131720. Its totient is φ = 13579200.

The previous prime is 51353543. The next prime is 51353569. The reversal of 51353550 is 5535315.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 62140 + ... + 62960.

It is an arithmetic number, because the mean of its divisors is an integer number (1932385).

Almost surely, 2^51353550 is an apocalyptic number.

51353550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51353550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69565860).

51353550 is an abundant number, since it is smaller than the sum of its proper divisors (87778170).

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

51353550 is a wasteful number, since it uses less digits than its factorization.

51353550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978 (or 970 counting only the distinct ones).

The product of its (nonzero) digits is 5625, while the sum is 27.

The square root of 51353550 is about 7166.1391278707. The cubic root of 51353550 is about 371.6979424526.

Adding to 51353550 its reverse (5535315), we get a palindrome (56888865).

The spelling of 51353550 in words is "fifty-one million, three hundred fifty-three thousand, five hundred fifty".