191238868 has 6 divisors (see below), whose sum is σ = 334668026. Its totient is φ = 95619432.

The previous prime is 191238863. The next prime is 191238877. The reversal of 191238868 is 868832191.

It can be written as a sum of positive squares in only one way, i.e., 188842564 + 2396304 = 13742^2 + 1548^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191238863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23904855 + ... + 23904862.

Almost surely, 2^191238868 is an apocalyptic number.

It is an amenable number.

191238868 is a deficient number, since it is larger than the sum of its proper divisors (143429158).

191238868 is a wasteful number, since it uses less digits than its factorization.

191238868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47809721 (or 47809719 counting only the distinct ones).

The product of its digits is 165888, while the sum is 46.

The square root of 191238868 is about 13828.9142017730. The cubic root of 191238868 is about 576.1364975185.

The spelling of 191238868 in words is "one hundred ninety-one million, two hundred thirty-eight thousand, eight hundred sixty-eight".