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13220001 = 321468889
BaseRepresentation
bin110010011011…
…100010100001
3220212122102200
4302123202201
511341020001
61151203413
7220240164
oct62334241
926778380
1013220001
11750a423
124516569
13297b3b2
141a81adb
151262086
hexc9b8a1

13220001 has 6 divisors (see below), whose sum is σ = 19095570. Its totient is φ = 8813328.

The previous prime is 13219979. The next prime is 13220003. The reversal of 13220001 is 10002231.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8910225 + 4309776 = 2985^2 + 2076^2 .

It is not a de Polignac number, because 13220001 - 210 = 13218977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1468889 = 13220001 / (1 + 3 + 2 + 2 + 0 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (13220003) 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 5 ways as a sum of consecutive naturals, for example, 734436 + ... + 734453.

It is an arithmetic number, because the mean of its divisors is an integer number (3182595).

Almost surely, 213220001 is an apocalyptic number.

It is an amenable number.

13220001 is a deficient number, since it is larger than the sum of its proper divisors (5875569).

13220001 is a wasteful number, since it uses less digits than its factorization.

13220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468895 (or 1468892 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 13220001 is about 3635.9319300559. The cubic root of 13220001 is about 236.4524560001.

Adding to 13220001 its reverse (10002231), we get a palindrome (23222232).

The spelling of 13220001 in words is "thirteen million, two hundred twenty thousand, one".

Divisors: 1 3 9 1468889 4406667 13220001