81386049 has 8 divisors (see below), whose sum is σ = 109510720. Its totient is φ = 53759376.

The previous prime is 81386047. The next prime is 81386069. The reversal of 81386049 is 94068318.

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

It is not a de Polignac number, because 81386049 - 2¹ = 81386047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81385998 and 81386016.

It is not an unprimeable number, because it can be changed into a prime (81386047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124117 + ... + 124770.

It is an arithmetic number, because the mean of its divisors is an integer number (13688840).

Almost surely, 2^81386049 is an apocalyptic number.

It is an amenable number.

81386049 is a deficient number, since it is larger than the sum of its proper divisors (28124671).

81386049 is a wasteful number, since it uses less digits than its factorization.

81386049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248999.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 81386049 is about 9021.4216728850. The cubic root of 81386049 is about 433.3611634329.

The spelling of 81386049 in words is "eighty-one million, three hundred eighty-six thousand, forty-nine".