81479063 has 2 divisors, whose sum is σ = 81479064. Its totient is φ = 81479062.

The previous prime is 81479053. The next prime is 81479081. The reversal of 81479063 is 36097418.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81479063 is a prime.

It is equal to p_4750868 and since 81479063 and 4750868 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81479053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40739531 + 40739532.

It is an arithmetic number, because the mean of its divisors is an integer number (40739532).

Almost surely, 2^81479063 is an apocalyptic number.

81479063 is a deficient number, since it is larger than the sum of its proper divisors (1).

81479063 is an equidigital number, since it uses as much as digits as its factorization.

81479063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 81479063 is about 9026.5753749692. The cubic root of 81479063 is about 433.5261929827.

The spelling of 81479063 in words is "eighty-one million, four hundred seventy-nine thousand, sixty-three".