81431027 has 2 divisors, whose sum is σ = 81431028. Its totient is φ = 81431026.

The previous prime is 81431023. The next prime is 81431039. The reversal of 81431027 is 72013418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81431027 - 2² = 81431023 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81430987 and 81431005.

It is not a weakly prime, because it can be changed into another prime (81431023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40715513 + 40715514.

It is an arithmetic number, because the mean of its divisors is an integer number (40715514).

Almost surely, 2^81431027 is an apocalyptic number.

81431027 is a deficient number, since it is larger than the sum of its proper divisors (1).

81431027 is an equidigital number, since it uses as much as digits as its factorization.

81431027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 81431027 is about 9023.9141729075. The cubic root of 81431027 is about 433.4409810800.

The spelling of 81431027 in words is "eighty-one million, four hundred thirty-one thousand, twenty-seven".