27861494831 has 2 divisors, whose sum is σ = 27861494832. Its totient is φ = 27861494830.

The previous prime is 27861494827. The next prime is 27861494833. The reversal of 27861494831 is 13849416872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27861494831 - 2² = 27861494827 is a prime.

It is a super-2 number, since 2×27861494831² (a number of 22 digits) contains 22 as substring.

Together with 27861494833, 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 (27861494833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13930747415 + 13930747416.

It is an arithmetic number, because the mean of its divisors is an integer number (13930747416).

Almost surely, 2^27861494831 is an apocalyptic number.

27861494831 is a deficient number, since it is larger than the sum of its proper divisors (1).

27861494831 is an equidigital number, since it uses as much as digits as its factorization.

27861494831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 53.

The spelling of 27861494831 in words is "twenty-seven billion, eight hundred sixty-one million, four hundred ninety-four thousand, eight hundred thirty-one".