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11755981 = 614392
BaseRepresentation
bin101100110110…
…000111001101
3211010021011201
4230312013031
511002142411
61055545501
7201631666
oct54660715
924107151
1011755981
1166aa496
123b2b291
132587c03
1417c036d
1510733c1
hexb361cd

11755981 has 6 divisors (see below), whose sum is σ = 11975982. Its totient is φ = 11536920.

The previous prime is 11755979. The next prime is 11755999. The reversal of 11755981 is 18955711.

It can be written as a sum of positive squares in only one way, i.e., 6937956 + 4818025 = 2634^2 + 2195^2 .

It is not a de Polignac number, because 11755981 - 21 = 11755979 is a prime.

It is a super-2 number, since 2×117559812 = 276406178544722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11755981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11755181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26560 + ... + 26998.

It is an arithmetic number, because the mean of its divisors is an integer number (1995997).

Almost surely, 211755981 is an apocalyptic number.

11755981 is the 2169-th centered pentagonal number.

It is an amenable number.

11755981 is a deficient number, since it is larger than the sum of its proper divisors (220001).

11755981 is an frugal number, since it uses more digits than its factorization.

11755981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939 (or 500 counting only the distinct ones).

The product of its digits is 12600, while the sum is 37.

The square root of 11755981 is about 3428.6996077230. The cubic root of 11755981 is about 227.3803645830.

The spelling of 11755981 in words is "eleven million, seven hundred fifty-five thousand, nine hundred eighty-one".

Divisors: 1 61 439 26779 192721 11755981