81005254 has 8 divisors (see below), whose sum is σ = 132554088. Its totient is φ = 36820560.

The previous prime is 81005251. The next prime is 81005269. The reversal of 81005254 is 45250018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81005251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1841007 + ... + 1841050.

It is an arithmetic number, because the mean of its divisors is an integer number (16569261).

Almost surely, 2^81005254 is an apocalyptic number.

81005254 is a deficient number, since it is larger than the sum of its proper divisors (51548834).

81005254 is a wasteful number, since it uses less digits than its factorization.

81005254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3682070.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 81005254 is about 9000.2918841558. The cubic root of 81005254 is about 432.6842259261.

The spelling of 81005254 in words is "eighty-one million, five thousand, two hundred fifty-four".