190909181909 has 32 divisors (see below), whose sum is σ = 205612992000. Its totient is φ = 176622925824.

The previous prime is 190909181867. The next prime is 190909181921. The reversal of 190909181909 is 909181909091.

It is a de Polignac number, because none of the positive numbers 2^k-190909181909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190909181509) 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, 169095257 + ... + 169096385.

It is an arithmetic number, because the mean of its divisors is an integer number (6425406000).

Almost surely, 2^190909181909 is an apocalyptic number.

It is an amenable number.

190909181909 is a deficient number, since it is larger than the sum of its proper divisors (14703810091).

190909181909 is a wasteful number, since it uses less digits than its factorization.

190909181909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877.

The product of its (nonzero) digits is 472392, while the sum is 56.

The spelling of 190909181909 in words is "one hundred ninety billion, nine hundred nine million, one hundred eighty-one thousand, nine hundred nine".