81000093 has 8 divisors (see below), whose sum is σ = 108302400. Its totient is φ = 53848928.

The previous prime is 81000083. The next prime is 81000107. The reversal of 81000093 is 39000018.

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

It is a cyclic number.

It is not a de Polignac number, because 81000093 - 2⁴ = 81000077 is a prime.

It is a super-2 number, since 2×81000093² = 13122030132017298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81000013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36528 + ... + 38681.

It is an arithmetic number, because the mean of its divisors is an integer number (13537800).

Almost surely, 2^81000093 is an apocalyptic number.

It is an amenable number.

81000093 is a deficient number, since it is larger than the sum of its proper divisors (27302307).

81000093 is a wasteful number, since it uses less digits than its factorization.

81000093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75571.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 81000093 is about 9000.0051666652. The cubic root of 81000093 is about 432.6750366838.

The spelling of 81000093 in words is "eighty-one million, ninety-three", and thus it is an aban number and an uban number.