81080247 has 8 divisors (see below), whose sum is σ = 110743920. Its totient is φ = 52735040.

The previous prime is 81080231. The next prime is 81080273. The reversal of 81080247 is 74208018.

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

It is a cyclic number.

It is not a de Polignac number, because 81080247 - 2⁴ = 81080231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81080047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329472 + ... + 329717.

It is an arithmetic number, because the mean of its divisors is an integer number (13842990).

Almost surely, 2^81080247 is an apocalyptic number.

81080247 is a deficient number, since it is larger than the sum of its proper divisors (29663673).

81080247 is a wasteful number, since it uses less digits than its factorization.

81080247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659233.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 81080247 is about 9004.4570630327. The cubic root of 81080247 is about 432.8177081320.

The spelling of 81080247 in words is "eighty-one million, eighty thousand, two hundred forty-seven".