81498847 has 8 divisors (see below), whose sum is σ = 85881600. Its totient is φ = 77125464.

The previous prime is 81498817. The next prime is 81498863. The reversal of 81498847 is 74889418.

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 81498847 - 2⁷ = 81498719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81498847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81498817) 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, 22218 + ... + 25624.

It is an arithmetic number, because the mean of its divisors is an integer number (10735200).

Almost surely, 2^81498847 is an apocalyptic number.

81498847 is a deficient number, since it is larger than the sum of its proper divisors (4382753).

81498847 is a wasteful number, since it uses less digits than its factorization.

81498847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685.

The product of its digits is 516096, while the sum is 49.

The square root of 81498847 is about 9027.6711836442. The cubic root of 81498847 is about 433.5612784300.

The spelling of 81498847 in words is "eighty-one million, four hundred ninety-eight thousand, eight hundred forty-seven".