81083465 has 16 divisors (see below), whose sum is σ = 100871760. Its totient is φ = 62519040.

The previous prime is 81083461. The next prime is 81083473. The reversal of 81083465 is 56438018.

It can be written as a sum of positive squares in 8 ways, for example, as 11449 + 81072016 = 107^2 + 9004^2 .

It is not a de Polignac number, because 81083465 - 2² = 81083461 is a prime.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (81083461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18155 + ... + 22175.

It is an arithmetic number, because the mean of its divisors is an integer number (6304485).

Almost surely, 2^81083465 is an apocalyptic number.

It is an amenable number.

81083465 is a deficient number, since it is larger than the sum of its proper divisors (19788295).

81083465 is a wasteful number, since it uses less digits than its factorization.

81083465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4172.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 81083465 is about 9004.6357505454. The cubic root of 81083465 is about 432.8234341010.

The spelling of 81083465 in words is "eighty-one million, eighty-three thousand, four hundred sixty-five".