81533110 has 16 divisors (see below), whose sum is σ = 147265776. Its totient is φ = 32500768.

The previous prime is 81533077. The next prime is 81533119. The reversal of 81533110 is 1133518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81533119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10984 + ... + 16843.

It is an arithmetic number, because the mean of its divisors is an integer number (9204111).

Almost surely, 2^81533110 is an apocalyptic number.

81533110 is a deficient number, since it is larger than the sum of its proper divisors (65732666).

81533110 is a wasteful number, since it uses less digits than its factorization.

81533110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28127.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 81533110 is about 9029.5686497197. The cubic root of 81533110 is about 433.6220278736.

Adding to 81533110 its reverse (1133518), we get a palindrome (82666628).

The spelling of 81533110 in words is "eighty-one million, five hundred thirty-three thousand, one hundred ten".