27747723431 has 2 divisors, whose sum is σ = 27747723432. Its totient is φ = 27747723430.

The previous prime is 27747723407. The next prime is 27747723433. The reversal of 27747723431 is 13432774772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27747723431 - 2¹⁴ = 27747707047 is a prime.

It is a super-2 number, since 2×27747723431² (a number of 22 digits) contains 22 as substring.

Together with 27747723433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27747723433) 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 as a sum of consecutive naturals, namely, 13873861715 + 13873861716.

It is an arithmetic number, because the mean of its divisors is an integer number (13873861716).

Almost surely, 2^27747723431 is an apocalyptic number.

27747723431 is a deficient number, since it is larger than the sum of its proper divisors (1).

27747723431 is an equidigital number, since it uses as much as digits as its factorization.

27747723431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382976, while the sum is 47.

The spelling of 27747723431 in words is "twenty-seven billion, seven hundred forty-seven million, seven hundred twenty-three thousand, four hundred thirty-one".