16505961 has 16 divisors (see below), whose sum is σ = 22471680. Its totient is φ = 10774800.

The previous prime is 16505921. The next prime is 16505969. The reversal of 16505961 is 16950561.

It is not a de Polignac number, because 16505961 - 2⁹ = 16505449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16505969) 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, 37380 + ... + 37818.

It is an arithmetic number, because the mean of its divisors is an integer number (1404480).

Almost surely, 2^16505961 is an apocalyptic number.

It is an amenable number.

16505961 is a deficient number, since it is larger than the sum of its proper divisors (5965719).

16505961 is a wasteful number, since it uses less digits than its factorization.

16505961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 16505961 is about 4062.7528844369. The cubic root of 16505961 is about 254.6128226565.

The spelling of 16505961 in words is "sixteen million, five hundred five thousand, nine hundred sixty-one".