81093573 has 48 divisors (see below), whose sum is σ = 132088320. Its totient is φ = 47527200.

The previous prime is 81093569. The next prime is 81093589. The reversal of 81093573 is 37539018.

81093573 is a `hidden beast` number, since 81 + 0 + 9 + 3 + 573 = 666.

It is not a de Polignac number, because 81093573 - 2² = 81093569 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81093503) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 583338 + ... + 583476.

It is an arithmetic number, because the mean of its divisors is an integer number (2751840).

Almost surely, 2^81093573 is an apocalyptic number.

81093573 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

It is an amenable number.

81093573 is a deficient number, since it is larger than the sum of its proper divisors (50994747).

81093573 is a wasteful number, since it uses less digits than its factorization.

81093573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 81093573 is about 9005.1969995109. The cubic root of 81093573 is about 432.8414188508.

The spelling of 81093573 in words is "eighty-one million, ninety-three thousand, five hundred seventy-three".