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16605121 = 131817057
BaseRepresentation
bin111111010101…
…111111000001
31011020121221111
4333111333001
513222330441
61351523321
7261066301
oct77257701
934217844
1016605121
119411745
125689541
133595120
1422c3601
1516d0081
hexfd5fc1

16605121 has 8 divisors (see below), whose sum is σ = 17983784. Its totient is φ = 15240960.

The previous prime is 16605109. The next prime is 16605143. The reversal of 16605121 is 12150661.

It can be written as a sum of positive squares in 4 ways, for example, as 923521 + 15681600 = 961^2 + 3960^2 .

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

It is a 5-Lehmer number, since φ(16605121) divides (16605121-1)5.

It is a cyclic number.

It is not a de Polignac number, because 16605121 - 219 = 16080833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16605092 and 16605101.

It is not an unprimeable number, because it can be changed into a prime (16605161) 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, 1176 + ... + 5881.

It is an arithmetic number, because the mean of its divisors is an integer number (2247973).

Almost surely, 216605121 is an apocalyptic number.

16605121 is the 2353-rd octagonal number.

It is an amenable number.

16605121 is a deficient number, since it is larger than the sum of its proper divisors (1378663).

16605121 is a wasteful number, since it uses less digits than its factorization.

16605121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7251.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 16605121 is about 4074.9381590400. The cubic root of 16605121 is about 255.1216694787.

Adding to 16605121 its reverse (12150661), we get a palindrome (28755782).

The spelling of 16605121 in words is "sixteen million, six hundred five thousand, one hundred twenty-one".

Divisors: 1 13 181 2353 7057 91741 1277317 16605121