81093313 has 8 divisors (see below), whose sum is σ = 94833728. Its totient is φ = 67891824.

The previous prime is 81093223. The next prime is 81093319. The reversal of 81093313 is 31339018.

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

It is a de Polignac number, because none of the positive numbers 2^k-81093313 is a prime.

It is a super-2 number, since 2×81093313² = 13152250826631938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81093319) 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, 134406 + ... + 135007.

It is an arithmetic number, because the mean of its divisors is an integer number (11854216).

Almost surely, 2^81093313 is an apocalyptic number.

It is an amenable number.

81093313 is a deficient number, since it is larger than the sum of its proper divisors (13740415).

81093313 is a wasteful number, since it uses less digits than its factorization.

81093313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269463.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 81093313 is about 9005.1825633909. The cubic root of 81093313 is about 432.8409562622.

It can be divided in two parts, 81093 and 313, that added together give a triangular number (81406 = T₄₀₃).

The spelling of 81093313 in words is "eighty-one million, ninety-three thousand, three hundred thirteen".