16520449 has 4 divisors (see below), whose sum is σ = 18022320. Its totient is φ = 15018580.

The previous prime is 16520429. The next prime is 16520473. The reversal of 16520449 is 94402561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94402561 = 11 ⋅8582051.

It is a cyclic number.

It is not a de Polignac number, because 16520449 - 2⁷ = 16520321 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16520449.

It is not an unprimeable number, because it can be changed into a prime (16520429) 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, 750919 + ... + 750940.

It is an arithmetic number, because the mean of its divisors is an integer number (4505580).

Almost surely, 2^16520449 is an apocalyptic number.

It is an amenable number.

16520449 is a deficient number, since it is larger than the sum of its proper divisors (1501871).

16520449 is a wasteful number, since it uses less digits than its factorization.

16520449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501870.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 16520449 is about 4064.5355208191. The cubic root of 16520449 is about 254.6872957882.

The spelling of 16520449 in words is "sixteen million, five hundred twenty thousand, four hundred forty-nine".