15664193 has 2 divisors, whose sum is σ = 15664194. Its totient is φ = 15664192.

The previous prime is 15664183. The next prime is 15664211. The reversal of 15664193 is 39146651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8862529 + 6801664 = 2977^2 + 2608^2 .

It is an emirp because it is prime and its reverse (39146651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15664193 - 2⁴ = 15664177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15664133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7832096 + 7832097.

It is an arithmetic number, because the mean of its divisors is an integer number (7832097).

Almost surely, 2^15664193 is an apocalyptic number.

It is an amenable number.

15664193 is a deficient number, since it is larger than the sum of its proper divisors (1).

15664193 is an equidigital number, since it uses as much as digits as its factorization.

15664193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 15664193 is about 3957.8015362067. The cubic root of 15664193 is about 250.2088548034.

The spelling of 15664193 in words is "fifteen million, six hundred sixty-four thousand, one hundred ninety-three".