81330301 has 4 divisors (see below), whose sum is σ = 87586492. Its totient is φ = 75074112.

The previous prime is 81330299. The next prime is 81330307. The reversal of 81330301 is 10303318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10303318 = 2 ⋅5151659.

It can be written as a sum of positive squares in 2 ways, for example, as 4347225 + 76983076 = 2085^2 + 8774^2 .

It is a cyclic number.

It is not a de Polignac number, because 81330301 - 2¹ = 81330299 is a prime.

It is a super-2 number, since 2×81330301² = 13229235721501202, 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 (81330307) 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, 3128076 + ... + 3128101.

It is an arithmetic number, because the mean of its divisors is an integer number (21896623).

Almost surely, 2^81330301 is an apocalyptic number.

It is an amenable number.

81330301 is a deficient number, since it is larger than the sum of its proper divisors (6256191).

81330301 is a wasteful number, since it uses less digits than its factorization.

81330301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6256190.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 81330301 is about 9018.3313866812. The cubic root of 81330301 is about 433.2621925949.

Adding to 81330301 its reverse (10303318), we get a palindrome (91633619).

The spelling of 81330301 in words is "eighty-one million, three hundred thirty thousand, three hundred one".