16971553 has 2 divisors, whose sum is σ = 16971554. Its totient is φ = 16971552.

The previous prime is 16971533. The next prime is 16971589. The reversal of 16971553 is 35517961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9529569 + 7441984 = 3087^2 + 2728^2 .

It is an emirp because it is prime and its reverse (35517961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16971553 - 2¹³ = 16963361 is a prime.

It is a super-2 number, since 2×16971553² = 576067222463618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16971533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8485776 + 8485777.

It is an arithmetic number, because the mean of its divisors is an integer number (8485777).

Almost surely, 2^16971553 is an apocalyptic number.

It is an amenable number.

16971553 is a deficient number, since it is larger than the sum of its proper divisors (1).

16971553 is an equidigital number, since it uses as much as digits as its factorization.

16971553 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 16971553 is about 4119.6544758026. The cubic root of 16971553 is about 256.9846569391.

The spelling of 16971553 in words is "sixteen million, nine hundred seventy-one thousand, five hundred fifty-three".