2185129019 has 4 divisors (see below), whose sum is σ = 2212788960. Its totient is φ = 2157469080.

The previous prime is 2185128973. The next prime is 2185129021. The reversal of 2185129019 is 9109215812.

It is a happy number.

2185129019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2185129019 - 2¹² = 2185124923 is a prime.

It is a super-2 number, since 2×2185129019² = 9549577659351804722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2185129049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13829852 + ... + 13830009.

It is an arithmetic number, because the mean of its divisors is an integer number (553197240).

Almost surely, 2^2185129019 is an apocalyptic number.

2185129019 is a deficient number, since it is larger than the sum of its proper divisors (27659941).

2185129019 is an equidigital number, since it uses as much as digits as its factorization.

2185129019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27659940.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 2185129019 is about 46745.3636096672. The cubic root of 2185129019 is about 1297.6543538240.

The spelling of 2185129019 in words is "two billion, one hundred eighty-five million, one hundred twenty-nine thousand, nineteen".