81180323 has 4 divisors (see below), whose sum is σ = 92777520. Its totient is φ = 69583128.

The previous prime is 81180313. The next prime is 81180329. The reversal of 81180323 is 32308118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32308118 = 2 ⋅16154059.

It is a cyclic number.

It is not a de Polignac number, because 81180323 - 2¹⁴ = 81163939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81180292 and 81180301.

It is not an unprimeable number, because it can be changed into a prime (81180329) 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, 5798588 + ... + 5798601.

It is an arithmetic number, because the mean of its divisors is an integer number (23194380).

Almost surely, 2^81180323 is an apocalyptic number.

81180323 is a deficient number, since it is larger than the sum of its proper divisors (11597197).

81180323 is a wasteful number, since it uses less digits than its factorization.

81180323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11597196.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 81180323 is about 9010.0123751302. The cubic root of 81180323 is about 432.9957081501.

The spelling of 81180323 in words is "eighty-one million, one hundred eighty thousand, three hundred twenty-three".