27731842291 has 4 divisors (see below), whose sum is σ = 27740685672. Its totient is φ = 27722998912.

The previous prime is 27731842283. The next prime is 27731842309. The reversal of 27731842291 is 19224813772.

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

It is a cyclic number.

It is not a de Polignac number, because 27731842291 - 2³ = 27731842283 is a prime.

It is a super-2 number, since 2×27731842291² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27731842991) 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, 4416985 + ... + 4423258.

It is an arithmetic number, because the mean of its divisors is an integer number (6935171418).

Almost surely, 2^27731842291 is an apocalyptic number.

27731842291 is a deficient number, since it is larger than the sum of its proper divisors (8843381).

27731842291 is an equidigital number, since it uses as much as digits as its factorization.

27731842291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8843380.

The product of its digits is 338688, while the sum is 46.

The spelling of 27731842291 in words is "twenty-seven billion, seven hundred thirty-one million, eight hundred forty-two thousand, two hundred ninety-one".