55551100 has 54 divisors (see below), whose sum is σ = 132529712. Its totient is φ = 20196000.

The previous prime is 55551077. The next prime is 55551103. The reversal of 55551100 is 115555.

It is a super-2 number, since 2×55551100² = 6171849422420000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55551103) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9805 + ... + 14395.

Almost surely, 2^55551100 is an apocalyptic number.

55551100 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 55551100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66264856).

55551100 is an abundant number, since it is smaller than the sum of its proper divisors (76978612).

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

55551100 is a wasteful number, since it uses less digits than its factorization.

55551100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4627 (or 4609 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 22.

The square root of 55551100 is about 7453.2610312534. The cubic root of 55551100 is about 381.5612132359.

Adding to 55551100 its reverse (115555), we get a palindrome (55666655).

It can be divided in two parts, 55 and 551100, that added together give a palindrome (551155).

The spelling of 55551100 in words is "fifty-five million, five hundred fifty-one thousand, one hundred".