81444148 has 6 divisors (see below), whose sum is σ = 142527266. Its totient is φ = 40722072.

The previous prime is 81444137. The next prime is 81444157. The reversal of 81444148 is 84144418.

It can be written as a sum of positive squares in only one way, i.e., 46539684 + 34904464 = 6822^2 + 5908^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10180515 + ... + 10180522.

Almost surely, 2^81444148 is an apocalyptic number.

It is an amenable number.

81444148 is a deficient number, since it is larger than the sum of its proper divisors (61083118).

81444148 is a wasteful number, since it uses less digits than its factorization.

81444148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20361041 (or 20361039 counting only the distinct ones).

The product of its digits is 16384, while the sum is 34.

The square root of 81444148 is about 9024.6411563009. The cubic root of 81444148 is about 433.4642599778.

The spelling of 81444148 in words is "eighty-one million, four hundred forty-four thousand, one hundred forty-eight".