81154484 has 6 divisors (see below), whose sum is σ = 142020354. Its totient is φ = 40577240.

The previous prime is 81154439. The next prime is 81154519. The reversal of 81154484 is 48445118.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 44890000 + 36264484 = 6700^2 + 6022^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10144307 + ... + 10144314.

It is an arithmetic number, because the mean of its divisors is an integer number (23670059).

Almost surely, 2^81154484 is an apocalyptic number.

It is an amenable number.

81154484 is a deficient number, since it is larger than the sum of its proper divisors (60865870).

81154484 is a wasteful number, since it uses less digits than its factorization.

81154484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20288625 (or 20288623 counting only the distinct ones).

The product of its digits is 20480, while the sum is 35.

The square root of 81154484 is about 9008.5783562114. The cubic root of 81154484 is about 432.9497636694.

The spelling of 81154484 in words is "eighty-one million, one hundred fifty-four thousand, four hundred eighty-four".