16557913 has 2 divisors, whose sum is σ = 16557914. Its totient is φ = 16557912.

The previous prime is 16557887. The next prime is 16557917. The reversal of 16557913 is 31975561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16540489 + 17424 = 4067^2 + 132^2 .

It is a cyclic number.

It is not a de Polignac number, because 16557913 - 2¹⁷ = 16426841 is a prime.

It is not a weakly prime, because it can be changed into another prime (16557917) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278956 + 8278957.

It is an arithmetic number, because the mean of its divisors is an integer number (8278957).

Almost surely, 2^16557913 is an apocalyptic number.

It is an amenable number.

16557913 is a deficient number, since it is larger than the sum of its proper divisors (1).

16557913 is an equidigital number, since it uses as much as digits as its factorization.

16557913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28350, while the sum is 37.

The square root of 16557913 is about 4069.1415556601. The cubic root of 16557913 is about 254.8796715384.

The spelling of 16557913 in words is "sixteen million, five hundred fifty-seven thousand, nine hundred thirteen".