81093471 has 8 divisors (see below), whose sum is σ = 110425344. Its totient is φ = 52911960.

The previous prime is 81093457. The next prime is 81093473. The reversal of 81093471 is 17439018.

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

It is not a de Polignac number, because 81093471 - 2⁹ = 81092959 is a prime.

It is a super-3 number, since 3×81093471³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81093473) 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, 287425 + ... + 287706.

It is an arithmetic number, because the mean of its divisors is an integer number (13803168).

Almost surely, 2^81093471 is an apocalyptic number.

81093471 is a deficient number, since it is larger than the sum of its proper divisors (29331873).

81093471 is a wasteful number, since it uses less digits than its factorization.

81093471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575181.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 81093471 is about 9005.1913361127. The cubic root of 81093471 is about 432.8412373739.

The spelling of 81093471 in words is "eighty-one million, ninety-three thousand, four hundred seventy-one".