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12111201 = 34149521
BaseRepresentation
bin101110001100…
…110101100001
3211210022110000
4232030311201
511100024301
61111330213
7204641424
oct56146541
924708400
1012111201
116922363
124080969
1326807bb
1418739bb
1510e3786
hexb8cd61

12111201 has 10 divisors (see below), whose sum is σ = 18092162. Its totient is φ = 8074080.

The previous prime is 12111199. The next prime is 12111217. The reversal of 12111201 is 10211121.

It is a happy number.

12111201 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12006225 + 104976 = 3465^2 + 324^2 .

It is not a de Polignac number, because 12111201 - 21 = 12111199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12111221) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 74680 + ... + 74841.

Almost surely, 212111201 is an apocalyptic number.

It is an amenable number.

12111201 is a deficient number, since it is larger than the sum of its proper divisors (5980961).

12111201 is an equidigital number, since it uses as much as digits as its factorization.

12111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149533 (or 149524 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 12111201 is about 3480.1150843040. The cubic root of 12111201 is about 229.6478606313.

Adding to 12111201 its reverse (10211121), we get a palindrome (22322322).

It can be divided in two parts, 1211120 and 1, that added together give a palindrome (1211121).

The spelling of 12111201 in words is "twelve million, one hundred eleven thousand, two hundred one".

Divisors: 1 3 9 27 81 149521 448563 1345689 4037067 12111201