16145809 has 2 divisors, whose sum is σ = 16145810. Its totient is φ = 16145808.

The previous prime is 16145777. The next prime is 16145813. The reversal of 16145809 is 90854161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13712209 + 2433600 = 3703^2 + 1560^2 .

It is a cyclic number.

It is not a de Polignac number, because 16145809 - 2⁵ = 16145777 is a prime.

It is equal to p_1039885 and since 16145809 and 1039885 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (16115809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8072904 + 8072905.

It is an arithmetic number, because the mean of its divisors is an integer number (8072905).

Almost surely, 2^16145809 is an apocalyptic number.

It is an amenable number.

16145809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16145809 is an equidigital number, since it uses as much as digits as its factorization.

16145809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 16145809 is about 4018.1847891803. The cubic root of 16145809 is about 252.7473457691.

The spelling of 16145809 in words is "sixteen million, one hundred forty-five thousand, eight hundred nine".