16531789 has 2 divisors, whose sum is σ = 16531790. Its totient is φ = 16531788.

The previous prime is 16531771. The next prime is 16531819. The reversal of 16531789 is 98713561.

16531789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11088900 + 5442889 = 3330^2 + 2333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16531789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16531709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8265894 + 8265895.

It is an arithmetic number, because the mean of its divisors is an integer number (8265895).

Almost surely, 2^16531789 is an apocalyptic number.

It is an amenable number.

16531789 is a deficient number, since it is larger than the sum of its proper divisors (1).

16531789 is an equidigital number, since it uses as much as digits as its factorization.

16531789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 16531789 is about 4065.9302748572. The cubic root of 16531789 is about 254.7455567825.

The spelling of 16531789 in words is "sixteen million, five hundred thirty-one thousand, seven hundred eighty-nine".