16520949 has 8 divisors (see below), whose sum is σ = 24475520. Its totient is φ = 11013948.

The previous prime is 16520947. The next prime is 16520951. The reversal of 16520949 is 94902561.

It is an interprime number because it is at equal distance from previous prime (16520947) and next prime (16520951).

It is not a de Polignac number, because 16520949 - 2¹ = 16520947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16520941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305917 + ... + 305970.

It is an arithmetic number, because the mean of its divisors is an integer number (3059440).

Almost surely, 2^16520949 is an apocalyptic number.

It is an amenable number.

16520949 is a deficient number, since it is larger than the sum of its proper divisors (7954571).

16520949 is an equidigital number, since it uses as much as digits as its factorization.

16520949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611896 (or 611890 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 16520949 is about 4064.5970279967. The cubic root of 16520949 is about 254.6898651768.

The spelling of 16520949 in words is "sixteen million, five hundred twenty thousand, nine hundred forty-nine".