81233771 has 8 divisors (see below), whose sum is σ = 82535040. Its totient is φ = 79941312.

The previous prime is 81233767. The next prime is 81233773. The reversal of 81233771 is 17733218.

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 81233771 - 2² = 81233767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81233773) 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, 17801 + ... + 21893.

It is an arithmetic number, because the mean of its divisors is an integer number (10316880).

Almost surely, 2^81233771 is an apocalyptic number.

81233771 is a deficient number, since it is larger than the sum of its proper divisors (1301269).

81233771 is a wasteful number, since it uses less digits than its factorization.

81233771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405.

The product of its digits is 7056, while the sum is 32.

The square root of 81233771 is about 9012.9779207541. The cubic root of 81233771 is about 433.0907134283.

Adding to 81233771 its reverse (17733218), we get a palindrome (98966989).

The spelling of 81233771 in words is "eighty-one million, two hundred thirty-three thousand, seven hundred seventy-one".