27946193291 has 4 divisors (see below), whose sum is σ = 29590087032. Its totient is φ = 26302299552.

The previous prime is 27946193243. The next prime is 27946193329. The reversal of 27946193291 is 19239164972.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27946193291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27946193221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821946845 + ... + 821946878.

It is an arithmetic number, because the mean of its divisors is an integer number (7397521758).

Almost surely, 2^27946193291 is an apocalyptic number.

27946193291 is a deficient number, since it is larger than the sum of its proper divisors (1643893741).

27946193291 is a wasteful number, since it uses less digits than its factorization.

27946193291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643893740.

The product of its digits is 1469664, while the sum is 53.

The spelling of 27946193291 in words is "twenty-seven billion, nine hundred forty-six million, one hundred ninety-three thousand, two hundred ninety-one".