16155409 has 2 divisors, whose sum is σ = 16155410. Its totient is φ = 16155408.

The previous prime is 16155397. The next prime is 16155431. The reversal of 16155409 is 90455161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12054784 + 4100625 = 3472^2 + 2025^2 .

It is an emirp because it is prime and its reverse (90455161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16155409 - 2¹³ = 16147217 is a prime.

It is not a weakly prime, because it can be changed into another prime (16155449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8077704 + 8077705.

It is an arithmetic number, because the mean of its divisors is an integer number (8077705).

Almost surely, 2^16155409 is an apocalyptic number.

It is an amenable number.

16155409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16155409 is an equidigital number, since it uses as much as digits as its factorization.

16155409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 16155409 is about 4019.3791809184. The cubic root of 16155409 is about 252.7974288130.

The spelling of 16155409 in words is "sixteen million, one hundred fifty-five thousand, four hundred nine".