81416439 has 12 divisors (see below), whose sum is σ = 126647976. Its totient is φ = 50102352.

The previous prime is 81416437. The next prime is 81416441. The reversal of 81416439 is 93461418.

81416439 is a `hidden beast` number, since 8 + 1 + 4 + 1 + 643 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (81416437) and next prime (81416441).

It is not a de Polignac number, because 81416439 - 2¹ = 81416437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81416437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 347817 + ... + 348050.

It is an arithmetic number, because the mean of its divisors is an integer number (10553998).

Almost surely, 2^81416439 is an apocalyptic number.

81416439 is a deficient number, since it is larger than the sum of its proper divisors (45231537).

81416439 is a wasteful number, since it uses less digits than its factorization.

81416439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695886 (or 695883 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 81416439 is about 9023.1058400087. The cubic root of 81416439 is about 433.4150965374.

The spelling of 81416439 in words is "eighty-one million, four hundred sixteen thousand, four hundred thirty-nine".