81101444 has 12 divisors (see below), whose sum is σ = 145389468. Its totient is φ = 39561600.

The previous prime is 81101417. The next prime is 81101453. The reversal of 81101444 is 44410118.

It can be written as a sum of positive squares in 2 ways, for example, as 21996100 + 59105344 = 4690^2 + 7688^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247097 + ... + 247424.

It is an arithmetic number, because the mean of its divisors is an integer number (12115789).

Almost surely, 2^81101444 is an apocalyptic number.

It is an amenable number.

81101444 is a deficient number, since it is larger than the sum of its proper divisors (64288024).

81101444 is a wasteful number, since it uses less digits than its factorization.

81101444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494566 (or 494564 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 81101444 is about 9005.6340143268. The cubic root of 81101444 is about 432.8554223633.

The spelling of 81101444 in words is "eighty-one million, one hundred one thousand, four hundred forty-four".