81068965 has 8 divisors (see below), whose sum is σ = 97341048. Its totient is φ = 64816320.

The previous prime is 81068947. The next prime is 81068969. The reversal of 81068965 is 56986018.

It can be written as a sum of positive squares in 4 ways, for example, as 55606849 + 25462116 = 7457^2 + 5046^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81068965 - 2¹³ = 81060773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81068969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6919 + ... + 14491.

It is an arithmetic number, because the mean of its divisors is an integer number (12167631).

Almost surely, 2^81068965 is an apocalyptic number.

It is an amenable number.

81068965 is a deficient number, since it is larger than the sum of its proper divisors (16272083).

81068965 is a wasteful number, since it uses less digits than its factorization.

81068965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9719.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 81068965 is about 9003.8305737058. The cubic root of 81068965 is about 432.7976322357.

It can be divided in two parts, 8106 and 8965, that added together give a palindrome (17071).

The spelling of 81068965 in words is "eighty-one million, sixty-eight thousand, nine hundred sixty-five".