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221790265 = 52310331867
BaseRepresentation
bin11010011100001…
…00000000111001
3120110100010001021
431032010000321
5423234242030
634001422441
75332120564
oct1516040071
9513303037
10221790265
11104216344
126233aa21
1336c46558
14216554db
151471097a
hexd384039

221790265 has 16 divisors (see below), whose sum is σ = 278137728. Its totient is φ = 169462656.

The previous prime is 221790223. The next prime is 221790277. The reversal of 221790265 is 562097122.

It is a cyclic number.

It is not a de Polignac number, because 221790265 - 29 = 221789753 is a prime.

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 221790265.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 117862 + ... + 119728.

It is an arithmetic number, because the mean of its divisors is an integer number (17383608).

Almost surely, 2221790265 is an apocalyptic number.

It is an amenable number.

221790265 is a deficient number, since it is larger than the sum of its proper divisors (56347463).

221790265 is a wasteful number, since it uses less digits than its factorization.

221790265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2928.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 221790265 is about 14892.6245168540. The cubic root of 221790265 is about 605.3141505322.

The spelling of 221790265 in words is "two hundred twenty-one million, seven hundred ninety thousand, two hundred sixty-five".

Divisors: 1 5 23 115 1033 1867 5165 9335 23759 42941 118795 214705 1928611 9643055 44358053 221790265