27731331247 has 4 divisors (see below), whose sum is σ = 27985747240. Its totient is φ = 27476915256.

The previous prime is 27731331223. The next prime is 27731331259. The reversal of 27731331247 is 74213313772.

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 27731331247 - 2²⁷ = 27597113519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27731331547) 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, 127207833 + ... + 127208050.

It is an arithmetic number, because the mean of its divisors is an integer number (6996436810).

Almost surely, 2^27731331247 is an apocalyptic number.

27731331247 is a deficient number, since it is larger than the sum of its proper divisors (254415993).

27731331247 is a wasteful number, since it uses less digits than its factorization.

27731331247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254415992.

The product of its digits is 148176, while the sum is 40.

The spelling of 27731331247 in words is "twenty-seven billion, seven hundred thirty-one million, three hundred thirty-one thousand, two hundred forty-seven".