551138700 has 216 divisors, whose sum is σ = 1926043392. Its totient is φ = 119180160.

The previous prime is 551138699. The next prime is 551138723. The reversal of 551138700 is 7831155.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 757737 + ... + 758463.

Almost surely, 2^551138700 is an apocalyptic number.

551138700 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 551138700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963021696).

551138700 is an abundant number, since it is smaller than the sum of its proper divisors (1374904692).

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

551138700 is a wasteful number, since it uses less digits than its factorization.

551138700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 551138700 is about 23476.3434120393. The cubic root of 551138700 is about 819.8863118213.

Adding to 551138700 its reverse (7831155), we get a palindrome (558969855).

The spelling of 551138700 in words is "five hundred fifty-one million, one hundred thirty-eight thousand, seven hundred".