1255081100 has 432 divisors, whose sum is σ = 3865065120. Its totient is φ = 348364800.

The previous prime is 1255081063. The next prime is 1255081103. The reversal of 1255081100 is 11805521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255081103) 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 143 ways as a sum of consecutive naturals, for example, 20575070 + ... + 20575130.

It is an arithmetic number, because the mean of its divisors is an integer number (8946910).

Almost surely, 2^1255081100 is an apocalyptic number.

1255081100 is a gapful number since it is divisible by the number (10) 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 1255081100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1932532560).

1255081100 is an abundant number, since it is smaller than the sum of its proper divisors (2609984020).

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

1255081100 is a wasteful number, since it uses less digits than its factorization.

1255081100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 1255081100 is about 35427.1237895486. The cubic root of 1255081100 is about 1078.6749582026.

Adding to 1255081100 its reverse (11805521), we get a palindrome (1266886621).

The spelling of 1255081100 in words is "one billion, two hundred fifty-five million, eighty-one thousand, one hundred".