81517027 has 2 divisors, whose sum is σ = 81517028. Its totient is φ = 81517026.

The previous prime is 81517003. The next prime is 81517097. The reversal of 81517027 is 72071518.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81517027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81517027.

It is not a weakly prime, because it can be changed into another prime (81517097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40758513 + 40758514.

It is an arithmetic number, because the mean of its divisors is an integer number (40758514).

Almost surely, 2^81517027 is an apocalyptic number.

81517027 is a deficient number, since it is larger than the sum of its proper divisors (1).

81517027 is an equidigital number, since it uses as much as digits as its factorization.

81517027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 81517027 is about 9028.6780316943. The cubic root of 81517027 is about 433.5935142972.

The spelling of 81517027 in words is "eighty-one million, five hundred seventeen thousand, twenty-seven".