81064081 has 6 divisors (see below), whose sum is σ = 94299090. Its totient is φ = 69483456.

The previous prime is 81064079. The next prime is 81064097. The reversal of 81064081 is 18046018.

It can be written as a sum of positive squares in only one way, i.e., 70560000 + 10504081 = 8400^2 + 3241^2 .

It is not a de Polignac number, because 81064081 - 2¹ = 81064079 is a prime.

It is a super-2 number, since 2×81064081² = 13142770456749122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81064001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 827136 + ... + 827233.

It is an arithmetic number, because the mean of its divisors is an integer number (15716515).

Almost surely, 2^81064081 is an apocalyptic number.

It is an amenable number.

81064081 is a deficient number, since it is larger than the sum of its proper divisors (13235009).

81064081 is a wasteful number, since it uses less digits than its factorization.

81064081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654383 (or 1654376 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 81064081 is about 9003.5593517231. The cubic root of 81064081 is about 432.7889407630.

The spelling of 81064081 in words is "eighty-one million, sixty-four thousand, eighty-one".