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BaseRepresentation
bin101110100010…
…110000101001
3211221212121221
4232202300221
511110413001
61113302041
7205464301
oct56426051
924855557
1012201001
11698387a
124104921
1326b2637
141898601
1511101a1
hexba2c29

12201001 has 8 divisors (see below), whose sum is σ = 12428744. Its totient is φ = 11975040.

The previous prime is 12200989. The next prime is 12201041. The reversal of 12201001 is 10010221.

It can be written as a sum of positive squares in 4 ways, for example, as 291600 + 11909401 = 540^2 + 3451^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-12201001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12201041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28771 + ... + 29191.

It is an arithmetic number, because the mean of its divisors is an integer number (1553593).

Almost surely, 212201001 is an apocalyptic number.

It is an amenable number.

12201001 is a deficient number, since it is larger than the sum of its proper divisors (227743).

12201001 is an equidigital number, since it uses as much as digits as its factorization.

12201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 12201001 is about 3492.9931291086. The cubic root of 12201001 is about 230.2140477432.

Adding to 12201001 its reverse (10010221), we get a palindrome (22211222).

The spelling of 12201001 in words is "twelve million, two hundred one thousand, one".

Divisors: 1 73 397 421 28981 30733 167137 12201001