27431278693831 has 2 divisors, whose sum is σ = 27431278693832. Its totient is φ = 27431278693830.

The previous prime is 27431278693783. The next prime is 27431278693843. The reversal of 27431278693831 is 13839687213472.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27431278693831 - 2¹⁷ = 27431278562759 is a prime.

It is a super-2 number, since 2×27431278693831² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27431278693031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13715639346915 + 13715639346916.

It is an arithmetic number, because the mean of its divisors is an integer number (13715639346916).

Almost surely, 2^{27431278693831} is an apocalyptic number.

27431278693831 is a deficient number, since it is larger than the sum of its proper divisors (1).

27431278693831 is an equidigital number, since it uses as much as digits as its factorization.

27431278693831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73156608, while the sum is 64.

The spelling of 27431278693831 in words is "twenty-seven trillion, four hundred thirty-one billion, two hundred seventy-eight million, six hundred ninety-three thousand, eight hundred thirty-one".