191838213 has 20 divisors (see below), whose sum is σ = 327513120. Its totient is φ = 109621512.

The previous prime is 191838211. The next prime is 191838247. The reversal of 191838213 is 312838191.

191838213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 191838213 - 2¹ = 191838211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191838211) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 168603 + ... + 169736.

It is an arithmetic number, because the mean of its divisors is an integer number (16375656).

Almost surely, 2^191838213 is an apocalyptic number.

It is an amenable number.

191838213 is a deficient number, since it is larger than the sum of its proper divisors (135674907).

191838213 is an equidigital number, since it uses as much as digits as its factorization.

191838213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338358 (or 338349 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 191838213 is about 13850.5672447016. The cubic root of 191838213 is about 576.7377428440.

The spelling of 191838213 in words is "one hundred ninety-one million, eight hundred thirty-eight thousand, two hundred thirteen".