2011551500 has 96 divisors (see below), whose sum is σ = 5090257536. Its totient is φ = 680140800.

The previous prime is 2011551497. The next prime is 2011551511. The reversal of 2011551500 is 51551102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251564 + ... + 259436.

It is an arithmetic number, because the mean of its divisors is an integer number (53023516).

Almost surely, 2^2011551500 is an apocalyptic number.

2011551500 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 2011551500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2545128768).

2011551500 is an abundant number, since it is smaller than the sum of its proper divisors (3078706036).

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

2011551500 is a wasteful number, since it uses less digits than its factorization.

2011551500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7972 (or 7960 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 2011551500 is about 44850.3232987233. The cubic root of 2011551500 is about 1262.3420578159.

The spelling of 2011551500 in words is "two billion, eleven million, five hundred fifty-one thousand, five hundred".