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11661261 = 341113839
BaseRepresentation
bin101100011110…
…111111001101
3210221110020120
4230132333031
510441130021
61053535153
7201055563
oct54367715
923843216
1011661261
116645307
123aa44b9
132553a71
141797a33
1510552c6
hexb1efcd

11661261 has 16 divisors (see below), whose sum is σ = 16087680. Its totient is φ = 7508480.

The previous prime is 11661259. The next prime is 11661271. The reversal of 11661261 is 16216611.

11661261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11661261 - 21 = 11661259 is a prime.

It is a super-2 number, since 2×116612612 = 271970016220242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661241) 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, 13480 + ... + 14318.

It is an arithmetic number, because the mean of its divisors is an integer number (1005480).

Almost surely, 211661261 is an apocalyptic number.

It is an amenable number.

11661261 is a deficient number, since it is larger than the sum of its proper divisors (4426419).

11661261 is a wasteful number, since it uses less digits than its factorization.

11661261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996.

The product of its digits is 432, while the sum is 24.

The square root of 11661261 is about 3414.8588550627. The cubic root of 11661261 is about 226.7680359260.

Adding to 11661261 its reverse (16216611), we get a palindrome (27877872).

The spelling of 11661261 in words is "eleven million, six hundred sixty-one thousand, two hundred sixty-one".

Divisors: 1 3 41 113 123 339 839 2517 4633 13899 34399 94807 103197 284421 3887087 11661261