2091518538 has 24 divisors (see below), whose sum is σ = 4282602048. Its totient is φ = 680955912.

The previous prime is 2091518491. The next prime is 2091518549. The reversal of 2091518538 is 8358151902.

It is a self number, because there is not a number n which added to its sum of digits gives 2091518538.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83170 + ... + 105357.

It is an arithmetic number, because the mean of its divisors is an integer number (178441752).

Almost surely, 2^2091518538 is an apocalyptic number.

2091518538 is an abundant number, since it is smaller than the sum of its proper divisors (2191083510).

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

2091518538 is a wasteful number, since it uses less digits than its factorization.

2091518538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188618 (or 188575 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 2091518538 is about 45733.1229854249. The cubic root of 2091518538 is about 1278.8528414254.

The spelling of 2091518538 in words is "two billion, ninety-one million, five hundred eighteen thousand, five hundred thirty-eight".