551145500 has 72 divisors (see below), whose sum is σ = 1232322000. Its totient is φ = 215335200.

The previous prime is 551145499. The next prime is 551145503. The reversal of 551145500 is 5541155.

It is a super-2 number, since 2×551145500² = 607522724340500000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 551145500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551145503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1104251 + ... + 1104749.

Almost surely, 2^551145500 is an apocalyptic number.

551145500 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 551145500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (616161000).

551145500 is an abundant number, since it is smaller than the sum of its proper divisors (681176500).

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

551145500 is a wasteful number, since it uses less digits than its factorization.

551145500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 553 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 551145500 is about 23476.4882382353. The cubic root of 551145500 is about 819.8896837517.

Adding to 551145500 its reverse (5541155), we get a palindrome (556686655).

The spelling of 551145500 in words is "five hundred fifty-one million, one hundred forty-five thousand, five hundred".