16798561 has 8 divisors (see below), whose sum is σ = 18532584. Its totient is φ = 15127680.

The previous prime is 16798553. The next prime is 16798571. The reversal of 16798561 is 16589761.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1440000 + 15358561 = 1200^2 + 3919^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16798561 - 2³ = 16798553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16798501) 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, 15226 + ... + 16291.

It is an arithmetic number, because the mean of its divisors is an integer number (2316573).

Almost surely, 2^16798561 is an apocalyptic number.

It is an amenable number.

16798561 is a deficient number, since it is larger than the sum of its proper divisors (1734023).

16798561 is a wasteful number, since it uses less digits than its factorization.

16798561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31571.

The product of its digits is 90720, while the sum is 43.

The square root of 16798561 is about 4098.6047625991. The cubic root of 16798561 is about 256.1085202751.

The spelling of 16798561 in words is "sixteen million, seven hundred ninety-eight thousand, five hundred sixty-one".