2051918988 has 48 divisors (see below), whose sum is σ = 5528216064. Its totient is φ = 580216320.

The previous prime is 2051918971. The next prime is 2051918993. The reversal of 2051918988 is 8898191502.

It is a self number, because there is not a number n which added to its sum of digits gives 2051918988.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117768 + ... + 134063.

It is an arithmetic number, because the mean of its divisors is an integer number (115171168).

Almost surely, 2^2051918988 is an apocalyptic number.

2051918988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2051918988 is an abundant number, since it is smaller than the sum of its proper divisors (3476297076).

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

2051918988 is a wasteful number, since it uses less digits than its factorization.

2051918988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251942 (or 251940 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 51.

The square root of 2051918988 is about 45298.1124110045. The cubic root of 2051918988 is about 1270.7303522230.

The spelling of 2051918988 in words is "two billion, fifty-one million, nine hundred eighteen thousand, nine hundred eighty-eight".