16315309 has 4 divisors (see below), whose sum is σ = 16443904. Its totient is φ = 16186716.

The previous prime is 16315301. The next prime is 16315333. The reversal of 16315309 is 90351361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90351361 = 59 ⋅1531379.

It is a cyclic number.

It is not a de Polignac number, because 16315309 - 2³ = 16315301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16315301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64107 + ... + 64360.

It is an arithmetic number, because the mean of its divisors is an integer number (4110976).

Almost surely, 2^16315309 is an apocalyptic number.

It is an amenable number.

16315309 is a deficient number, since it is larger than the sum of its proper divisors (128595).

16315309 is a wasteful number, since it uses less digits than its factorization.

16315309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128594.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 16315309 is about 4039.2213358518. The cubic root of 16315309 is about 253.6287226521.

The spelling of 16315309 in words is "sixteen million, three hundred fifteen thousand, three hundred nine".