81679063 has 2 divisors, whose sum is σ = 81679064. Its totient is φ = 81679062.

The previous prime is 81679057. The next prime is 81679111. The reversal of 81679063 is 36097618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81679063 - 2¹³ = 81670871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81679163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40839531 + 40839532.

It is an arithmetic number, because the mean of its divisors is an integer number (40839532).

Almost surely, 2^81679063 is an apocalyptic number.

81679063 is a deficient number, since it is larger than the sum of its proper divisors (1).

81679063 is an equidigital number, since it uses as much as digits as its factorization.

81679063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 81679063 is about 9037.6469835904. The cubic root of 81679063 is about 433.8806169261.

The spelling of 81679063 in words is "eighty-one million, six hundred seventy-nine thousand, sixty-three".