16953809 has 4 divisors (see below), whose sum is σ = 16980900. Its totient is φ = 16926720.

The previous prime is 16953803. The next prime is 16953817. The reversal of 16953809 is 90835961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90835961 = 157 ⋅578573.

It can be written as a sum of positive squares in 2 ways, for example, as 8526400 + 8427409 = 2920^2 + 2903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16953809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16953803) 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, 12584 + ... + 13865.

It is an arithmetic number, because the mean of its divisors is an integer number (4245225).

Almost surely, 2^16953809 is an apocalyptic number.

It is an amenable number.

16953809 is a deficient number, since it is larger than the sum of its proper divisors (27091).

16953809 is an equidigital number, since it uses as much as digits as its factorization.

16953809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27090.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 16953809 is about 4117.5003339405. The cubic root of 16953809 is about 256.8950653376.

The spelling of 16953809 in words is "sixteen million, nine hundred fifty-three thousand, eight hundred nine".