16081789 has 4 divisors (see below), whose sum is σ = 16140124. Its totient is φ = 16023456.

The previous prime is 16081781. The next prime is 16081801. The reversal of 16081789 is 98718061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4972900 + 11108889 = 2230^2 + 3333^2 .

It is a cyclic number.

It is not a de Polignac number, because 16081789 - 2³ = 16081781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16081781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28752 + ... + 29305.

It is an arithmetic number, because the mean of its divisors is an integer number (4035031).

Almost surely, 2^16081789 is an apocalyptic number.

It is an amenable number.

16081789 is a deficient number, since it is larger than the sum of its proper divisors (58335).

16081789 is an equidigital number, since it uses as much as digits as its factorization.

16081789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58334.

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

The square root of 16081789 is about 4010.2105929739. The cubic root of 16081789 is about 252.4128457827.

The spelling of 16081789 in words is "sixteen million, eighty-one thousand, seven hundred eighty-nine".