81016789 has 8 divisors (see below), whose sum is σ = 93631680. Its totient is φ = 68662176.

The previous prime is 81016783. The next prime is 81016799. The reversal of 81016789 is 98761018.

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 81016789 - 2¹⁵ = 80984021 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81016783) 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, 64399 + ... + 65644.

It is an arithmetic number, because the mean of its divisors is an integer number (11703960).

Almost surely, 2^81016789 is an apocalyptic number.

81016789 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

81016789 is a deficient number, since it is larger than the sum of its proper divisors (12614891).

81016789 is a wasteful number, since it uses less digits than its factorization.

81016789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130139.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 81016789 is about 9000.9326738955. The cubic root of 81016789 is about 432.7047627654.

The spelling of 81016789 in words is "eighty-one million, sixteen thousand, seven hundred eighty-nine".