191606677441 has 3 divisors (see below), whose sum is σ = 191607115171. Its totient is φ = 191606239712.

The previous prime is 191606677433. The next prime is 191606677447. The reversal of 191606677441 is 144776606191.

The square root of 191606677441 is 437729.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 144776606191 = 7 ⋅20682372313.

It can be written as a sum of positive squares in only one way, i.e., 13860117441 + 177746560000 = 117729^2 + 421600^2 .

It is not a de Polignac number, because 191606677441 - 2³ = 191606677433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191606677447) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 218865 + ... + 656593.

Almost surely, 2^191606677441 is an apocalyptic number.

191606677441 is the 437729-th square number.

191606677441 is the 218865-th centered octagonal number.

It is an amenable number.

191606677441 is a deficient number, since it is larger than the sum of its proper divisors (437730).

191606677441 is an frugal number, since it uses more digits than its factorization.

191606677441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875458 (or 437729 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 191606677441 in words is "one hundred ninety-one billion, six hundred six million, six hundred seventy-seven thousand, four hundred forty-one".