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2221309 = 19116911
BaseRepresentation
bin1000011110010011111101
311011212001201
420132103331
51032040214
6115335501
724611056
oct10362375
94155051
102221309
1112879a2
128b1591
135ca0ac
1441b72d
152dd274
hex21e4fd

2221309 has 4 divisors (see below), whose sum is σ = 2338240. Its totient is φ = 2104380.

The previous prime is 2221301. The next prime is 2221321. The reversal of 2221309 is 9031222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2221309 - 23 = 2221301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 116911 = 2221309 / (2 + 2 + 2 + 1 + 3 + 0 + 9).

It is a Duffinian number.

2221309 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221301) 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 3 ways as a sum of consecutive naturals, for example, 58437 + ... + 58474.

It is an arithmetic number, because the mean of its divisors is an integer number (584560).

22221309 is an apocalyptic number.

It is an amenable number.

2221309 is a deficient number, since it is larger than the sum of its proper divisors (116931).

2221309 is a wasteful number, since it uses less digits than its factorization.

2221309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116930.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 2221309 is about 1490.4056494794. The cubic root of 2221309 is about 130.4777098691.

The spelling of 2221309 in words is "two million, two hundred twenty-one thousand, three hundred nine".

Divisors: 1 19 116911 2221309