16611389 has 2 divisors, whose sum is σ = 16611390. Its totient is φ = 16611388.

The previous prime is 16611341. The next prime is 16611401. The reversal of 16611389 is 98311661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8602489 + 8008900 = 2933^2 + 2830^2 .

It is a cyclic number.

It is not a de Polignac number, because 16611389 - 2¹⁶ = 16545853 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 (16611689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8305694 + 8305695.

It is an arithmetic number, because the mean of its divisors is an integer number (8305695).

Almost surely, 2^16611389 is an apocalyptic number.

It is an amenable number.

16611389 is a deficient number, since it is larger than the sum of its proper divisors (1).

16611389 is an equidigital number, since it uses as much as digits as its factorization.

16611389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 16611389 is about 4075.7071779018. The cubic root of 16611389 is about 255.1537660321.

The spelling of 16611389 in words is "sixteen million, six hundred eleven thousand, three hundred eighty-nine".