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4991221 = 9075503
BaseRepresentation
bin10011000010100011110101
3100101120200001
4103002203311
52234204341
6254551301
760265444
oct23024365
910346601
104991221
1128a9a84
121808531
131059ab1
1493cd5b
15688d31
hex4c28f5

4991221 has 4 divisors (see below), whose sum is σ = 4997632. Its totient is φ = 4984812.

The previous prime is 4991201. The next prime is 4991237. The reversal of 4991221 is 1221994.

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 4991221 - 221 = 2894069 is a prime.

It is a pancake number, because a pancake can be divided into 4991221 parts by 3159 straight cuts.

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 4991221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991201) 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 3 ways as a sum of consecutive naturals, for example, 1845 + ... + 3658.

It is an arithmetic number, because the mean of its divisors is an integer number (1249408).

Almost surely, 24991221 is an apocalyptic number.

It is an amenable number.

4991221 is a deficient number, since it is larger than the sum of its proper divisors (6411).

4991221 is an equidigital number, since it uses as much as digits as its factorization.

4991221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6410.

The product of its digits is 1296, while the sum is 28.

The square root of 4991221 is about 2234.1040709868. The cubic root of 4991221 is about 170.8974568452.

It can be divided in two parts, 4991 and 221, that multiplied together give a palindrome (1103011).

The spelling of 4991221 in words is "four million, nine hundred ninety-one thousand, two hundred twenty-one".

Divisors: 1 907 5503 4991221