27731327837 has 2 divisors, whose sum is σ = 27731327838. Its totient is φ = 27731327836.

The previous prime is 27731327761. The next prime is 27731327851. The reversal of 27731327837 is 73872313772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27706934116 + 24393721 = 166454^2 + 4939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27731327837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27731327867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13865663918 + 13865663919.

It is an arithmetic number, because the mean of its divisors is an integer number (13865663919).

Almost surely, 2^27731327837 is an apocalyptic number.

It is an amenable number.

27731327837 is a deficient number, since it is larger than the sum of its proper divisors (1).

27731327837 is an equidigital number, since it uses as much as digits as its factorization.

27731327837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2074464, while the sum is 50.

The spelling of 27731327837 in words is "twenty-seven billion, seven hundred thirty-one million, three hundred twenty-seven thousand, eight hundred thirty-seven".