1001100128 has 24 divisors (see below), whose sum is σ = 2252475792. Its totient is φ = 429042816.

The previous prime is 1001100127. The next prime is 1001100137. The reversal of 1001100128 is 8210011001.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001100127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2234375 + ... + 2234822.

It is an arithmetic number, because the mean of its divisors is an integer number (93853158).

Almost surely, 2^1001100128 is an apocalyptic number.

It is an amenable number.

1001100128 is an abundant number, since it is smaller than the sum of its proper divisors (1251375664).

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

1001100128 is an equidigital number, since it uses as much as digits as its factorization.

1001100128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4469214 (or 4469206 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 1001100128 is about 31640.1663712440. The cubic root of 1001100128 is about 1000.3665749397.

Adding to 1001100128 its reverse (8210011001), we get a palindrome (9211111129).

The spelling of 1001100128 in words is "one billion, one million, one hundred thousand, one hundred twenty-eight".