2155045100 has 72 divisors (see below), whose sum is σ = 5209926960. Its totient is φ = 768257280.

The previous prime is 2155045097. The next prime is 2155045111. The reversal of 2155045100 is 15405512.

It is a happy number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 9119 + ... + 66281.

Almost surely, 2^2155045100 is an apocalyptic number.

2155045100 is a gapful number since it is divisible by the number (20) 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 2155045100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2604963480).

2155045100 is an abundant number, since it is smaller than the sum of its proper divisors (3054881860).

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

2155045100 is a wasteful number, since it uses less digits than its factorization.

2155045100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57219 (or 57212 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 2155045100 is about 46422.4633124956. The cubic root of 2155045100 is about 1291.6716305509.

The spelling of 2155045100 in words is "two billion, one hundred fifty-five million, forty-five thousand, one hundred".