551522500 has 120 divisors (see below), whose sum is σ = 1346194080. Its totient is φ = 196416000.

The previous prime is 551522479. The next prime is 551522507. The reversal of 551522500 is 5225155.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (551522507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 807159 + ... + 807841.

It is an arithmetic number, because the mean of its divisors is an integer number (11218284).

Almost surely, 2^551522500 is an apocalyptic number.

551522500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551522500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (673097040).

551522500 is an abundant number, since it is smaller than the sum of its proper divisors (794671580).

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

551522500 is a wasteful number, since it uses less digits than its factorization.

551522500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743 (or 726 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 551522500 is about 23484.5161755570. The cubic root of 551522500 is about 820.0765841619.

Adding to 551522500 its reverse (5225155), we get a palindrome (556747655).

The spelling of 551522500 in words is "five hundred fifty-one million, five hundred twenty-two thousand, five hundred".