16810961 has 4 divisors (see below), whose sum is σ = 16965300. Its totient is φ = 16656624.

The previous prime is 16810933. The next prime is 16810993. The reversal of 16810961 is 16901861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16901861 = 3119 ⋅5419.

It can be written as a sum of positive squares in 2 ways, for example, as 11833600 + 4977361 = 3440^2 + 2231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16810961 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 (16810901) 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, 77006 + ... + 77223.

It is an arithmetic number, because the mean of its divisors is an integer number (4241325).

Almost surely, 2^16810961 is an apocalyptic number.

It is an amenable number.

16810961 is a deficient number, since it is larger than the sum of its proper divisors (154339).

16810961 is a wasteful number, since it uses less digits than its factorization.

16810961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154338.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 16810961 is about 4100.1171934470. The cubic root of 16810961 is about 256.1715210002.

It can be divided in two parts, 16810 and 961, that added together give a palindrome (17771).

The spelling of 16810961 in words is "sixteen million, eight hundred ten thousand, nine hundred sixty-one".