81085014319 has 2 divisors, whose sum is σ = 81085014320. Its totient is φ = 81085014318.

The previous prime is 81085014293. The next prime is 81085014379. The reversal of 81085014319 is 91341058018.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81085014319 - 2¹⁹ = 81084490031 is a prime.

It is a super-2 number, since 2×81085014319² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81085014379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40542507159 + 40542507160.

It is an arithmetic number, because the mean of its divisors is an integer number (40542507160).

Almost surely, 2^81085014319 is an apocalyptic number.

81085014319 is a deficient number, since it is larger than the sum of its proper divisors (1).

81085014319 is an equidigital number, since it uses as much as digits as its factorization.

81085014319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 40.

The spelling of 81085014319 in words is "eighty-one billion, eighty-five million, fourteen thousand, three hundred nineteen".