81333371 has 8 divisors (see below), whose sum is σ = 96157920. Its totient is φ = 67310208.

The previous prime is 81333361. The next prime is 81333391. The reversal of 81333371 is 17333318.

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-81333371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81333311) 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, 200126 + ... + 200531.

It is an arithmetic number, because the mean of its divisors is an integer number (12019740).

Almost surely, 2^81333371 is an apocalyptic number.

81333371 is a deficient number, since it is larger than the sum of its proper divisors (14824549).

81333371 is a wasteful number, since it uses less digits than its factorization.

81333371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400693.

The product of its digits is 4536, while the sum is 29.

The square root of 81333371 is about 9018.5015939456. The cubic root of 81333371 is about 433.2676440203.

Adding to 81333371 its reverse (17333318), we get a palindrome (98666689).

The spelling of 81333371 in words is "eighty-one million, three hundred thirty-three thousand, three hundred seventy-one".