81494827 has 2 divisors, whose sum is σ = 81494828. Its totient is φ = 81494826.

The previous prime is 81494807. The next prime is 81494863. The reversal of 81494827 is 72849418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81494827 - 2¹¹ = 81492779 is a prime.

It is not a weakly prime, because it can be changed into another prime (81494807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40747413 + 40747414.

It is an arithmetic number, because the mean of its divisors is an integer number (40747414).

Almost surely, 2^81494827 is an apocalyptic number.

81494827 is a deficient number, since it is larger than the sum of its proper divisors (1).

81494827 is an equidigital number, since it uses as much as digits as its factorization.

81494827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The square root of 81494827 is about 9027.4485321158. The cubic root of 81494827 is about 433.5541497198.

The spelling of 81494827 in words is "eighty-one million, four hundred ninety-four thousand, eight hundred twenty-seven".