191020027 has 4 divisors (see below), whose sum is σ = 208385496. Its totient is φ = 173654560.

The previous prime is 191020009. The next prime is 191020073. The reversal of 191020027 is 720020191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 720020191 = 11 ⋅65456381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191020027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191020087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8682718 + ... + 8682739.

It is an arithmetic number, because the mean of its divisors is an integer number (52096374).

Almost surely, 2^191020027 is an apocalyptic number.

191020027 is a deficient number, since it is larger than the sum of its proper divisors (17365469).

191020027 is a wasteful number, since it uses less digits than its factorization.

191020027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17365468.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 191020027 is about 13820.9994935243. Note that the first 3 decimals coincide. The cubic root of 191020027 is about 575.9166495825.

The spelling of 191020027 in words is "one hundred ninety-one million, twenty thousand, twenty-seven".