16481809 has 2 divisors, whose sum is σ = 16481810. Its totient is φ = 16481808.

The previous prime is 16481807. The next prime is 16481851. The reversal of 16481809 is 90818461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11751184 + 4730625 = 3428^2 + 2175^2 .

It is a cyclic number.

It is not a de Polignac number, because 16481809 - 2¹ = 16481807 is a prime.

Together with 16481807, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16481807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8240904 + 8240905.

It is an arithmetic number, because the mean of its divisors is an integer number (8240905).

Almost surely, 2^16481809 is an apocalyptic number.

It is an amenable number.

16481809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16481809 is an equidigital number, since it uses as much as digits as its factorization.

16481809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 16481809 is about 4059.7794275059. The cubic root of 16481809 is about 254.4885764188.

The spelling of 16481809 in words is "sixteen million, four hundred eighty-one thousand, eight hundred nine".