191648939 has 16 divisors (see below), whose sum is σ = 208935936. Its totient is φ = 175094400.

The previous prime is 191648921. The next prime is 191648959. The reversal of 191648939 is 939846191.

It is a cyclic number.

It is not a de Polignac number, because 191648939 - 2²⁰ = 190600363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191648959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103754 + ... + 105584.

It is an arithmetic number, because the mean of its divisors is an integer number (13058496).

Almost surely, 2^191648939 is an apocalyptic number.

191648939 is a deficient number, since it is larger than the sum of its proper divisors (17286997).

191648939 is a wasteful number, since it uses less digits than its factorization.

191648939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026.

The product of its digits is 419904, while the sum is 50.

The square root of 191648939 is about 13843.7328419758. The cubic root of 191648939 is about 576.5480041777.

The spelling of 191648939 in words is "one hundred ninety-one million, six hundred forty-eight thousand, nine hundred thirty-nine".