81067601 has 4 divisors (see below), whose sum is σ = 81178932. Its totient is φ = 80956272.

The previous prime is 81067589. The next prime is 81067607. The reversal of 81067601 is 10676018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10676018 = 2 ⋅5338009.

It can be written as a sum of positive squares in 2 ways, for example, as 70980625 + 10086976 = 8425^2 + 3176^2 .

It is a cyclic number.

It is not a de Polignac number, because 81067601 - 2¹⁰ = 81066577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81067607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54566 + ... + 56031.

It is an arithmetic number, because the mean of its divisors is an integer number (20294733).

Almost surely, 2^81067601 is an apocalyptic number.

It is an amenable number.

81067601 is a deficient number, since it is larger than the sum of its proper divisors (111331).

81067601 is a wasteful number, since it uses less digits than its factorization.

81067601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111330.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 81067601 is about 9003.7548278482. The cubic root of 81067601 is about 432.7952049226.

The spelling of 81067601 in words is "eighty-one million, sixty-seven thousand, six hundred one".