81518083 has 2 divisors, whose sum is σ = 81518084. Its totient is φ = 81518082.

The previous prime is 81518071. The next prime is 81518123. The reversal of 81518083 is 38081518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81518083 - 2⁹ = 81517571 is a prime.

It is a super-3 number, since 3×81518083³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (81518183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40759041 + 40759042.

It is an arithmetic number, because the mean of its divisors is an integer number (40759042).

Almost surely, 2^81518083 is an apocalyptic number.

81518083 is a deficient number, since it is larger than the sum of its proper divisors (1).

81518083 is an equidigital number, since it uses as much as digits as its factorization.

81518083 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 81518083 is about 9028.7365118271. The cubic root of 81518083 is about 433.5953865963.

The spelling of 81518083 in words is "eighty-one million, five hundred eighteen thousand, eighty-three".