2119178509 has 32 divisors (see below), whose sum is σ = 2691360000. Its totient is φ = 1661349312.

The previous prime is 2119178489. The next prime is 2119178527. The reversal of 2119178509 is 9058719112.

It is not a de Polignac number, because 2119178509 - 2⁷ = 2119178381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2119178599) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183387 + ... + 194599.

It is an arithmetic number, because the mean of its divisors is an integer number (84105000).

Almost surely, 2^2119178509 is an apocalyptic number.

2119178509 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2119178509 is a deficient number, since it is larger than the sum of its proper divisors (572181491).

2119178509 is a wasteful number, since it uses less digits than its factorization.

2119178509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11282 (or 11268 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 43.

The square root of 2119178509 is about 46034.5360463207. The cubic root of 2119178509 is about 1284.4657065043.

The spelling of 2119178509 in words is "two billion, one hundred nineteen million, one hundred seventy-eight thousand, five hundred nine".