16507969 has 9 divisors (see below), whose sum is σ = 17609827. Its totient is φ = 15471904.

The previous prime is 16507961. The next prime is 16507991. The reversal of 16507969 is 96970561.

The square root of 16507969 is 4063.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 12852225 + 3655744 = 3585^2 + 1912^2 .

It is not a de Polignac number, because 16507969 - 2³ = 16507961 is a prime.

It is a super-2 number, since 2×16507969² = 545026081009922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16507961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 68952 + ... + 69190.

Almost surely, 2^16507969 is an apocalyptic number.

16507969 is the 4063-rd square number.

16507969 is the 2032-nd centered octagonal number.

It is an amenable number.

16507969 is a deficient number, since it is larger than the sum of its proper divisors (1101858).

16507969 is an frugal number, since it uses more digits than its factorization.

16507969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 43.

The cubic root of 16507969 is about 254.6231470441.

The spelling of 16507969 in words is "sixteen million, five hundred seven thousand, nine hundred sixty-nine".