81244849 has 8 divisors (see below), whose sum is σ = 93258560. Its totient is φ = 69332976.

The previous prime is 81244781. The next prime is 81244861. The reversal of 81244849 is 94844218.

It is a happy number.

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 81244849 - 2²⁵ = 47690417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81244879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23739 + ... + 26944.

It is an arithmetic number, because the mean of its divisors is an integer number (11657320).

Almost surely, 2^81244849 is an apocalyptic number.

It is an amenable number.

81244849 is a deficient number, since it is larger than the sum of its proper divisors (12013711).

81244849 is a wasteful number, since it uses less digits than its factorization.

81244849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50919.

The product of its digits is 73728, while the sum is 40.

The square root of 81244849 is about 9013.5924580602. The cubic root of 81244849 is about 433.1103996614.

The spelling of 81244849 in words is "eighty-one million, two hundred forty-four thousand, eight hundred forty-nine".