81007049 has 8 divisors (see below), whose sum is σ = 81639168. Its totient is φ = 80377920.

The previous prime is 81007037. The next prime is 81007079. The reversal of 81007049 is 94070018.

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 81007049 - 2¹⁶ = 80941513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81007009) 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 7 ways as a sum of consecutive naturals, for example, 90884 + ... + 91770.

It is an arithmetic number, because the mean of its divisors is an integer number (10204896).

Almost surely, 2^81007049 is an apocalyptic number.

It is an amenable number.

81007049 is a deficient number, since it is larger than the sum of its proper divisors (632119).

81007049 is a wasteful number, since it uses less digits than its factorization.

81007049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 81007049 is about 9000.3916025915. The cubic root of 81007049 is about 432.6874218605.

The spelling of 81007049 in words is "eighty-one million, seven thousand, forty-nine".