16874521 has 2 divisors, whose sum is σ = 16874522. Its totient is φ = 16874520.

The previous prime is 16874513. The next prime is 16874537. The reversal of 16874521 is 12547861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16289296 + 585225 = 4036^2 + 765^2 .

It is an emirp because it is prime and its reverse (12547861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16874521 - 2³ = 16874513 is a prime.

It is not a weakly prime, because it can be changed into another prime (16874581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8437260 + 8437261.

It is an arithmetic number, because the mean of its divisors is an integer number (8437261).

Almost surely, 2^16874521 is an apocalyptic number.

It is an amenable number.

16874521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16874521 is an equidigital number, since it uses as much as digits as its factorization.

16874521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 34.

The square root of 16874521 is about 4107.8608788517. The cubic root of 16874521 is about 256.4939650793.

The spelling of 16874521 in words is "sixteen million, eight hundred seventy-four thousand, five hundred twenty-one".