16261505 has 16 divisors (see below), whose sum is σ = 21231504. Its totient is φ = 11884800.

The previous prime is 16261499. The next prime is 16261507. The reversal of 16261505 is 50516261.

It can be written as a sum of positive squares in 8 ways, for example, as 12544 + 16248961 = 112^2 + 4031^2 .

It is not a de Polignac number, because 16261505 - 2²⁰ = 15212929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16261507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5327 + ... + 7803.

It is an arithmetic number, because the mean of its divisors is an integer number (1326969).

Almost surely, 2^16261505 is an apocalyptic number.

It is an amenable number.

16261505 is a deficient number, since it is larger than the sum of its proper divisors (4969999).

16261505 is a wasteful number, since it uses less digits than its factorization.

16261505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 16261505 is about 4032.5556412776. Note that the first 3 decimals coincide. The cubic root of 16261505 is about 253.3496132582.

Adding to 16261505 its reverse (50516261), we get a palindrome (66777766).

The spelling of 16261505 in words is "sixteen million, two hundred sixty-one thousand, five hundred five".