190161809 has 8 divisors (see below), whose sum is σ = 191197608. Its totient is φ = 189129600.

The previous prime is 190161757. The next prime is 190161821. The reversal of 190161809 is 908161091.

190161809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 71351809 + 118810000 = 8447^2 + 10900^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 190161809 - 2⁸ = 190161553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190161109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238199 + ... + 238995.

It is an arithmetic number, because the mean of its divisors is an integer number (23899701).

Almost surely, 2^190161809 is an apocalyptic number.

It is an amenable number.

190161809 is a deficient number, since it is larger than the sum of its proper divisors (1035799).

190161809 is an equidigital number, since it uses as much as digits as its factorization.

190161809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 190161809 is about 13789.9169323096. The cubic root of 190161809 is about 575.0528586567.

The spelling of 190161809 in words is "one hundred ninety million, one hundred sixty-one thousand, eight hundred nine".