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220691 = 1991109
BaseRepresentation
bin110101111000010011
3102012201202
4311320103
524030231
64421415
71606262
oct657023
9365652
10220691
11140899
12a786b
13795b3
145a5d9
15455cb
hex35e13

220691 has 4 divisors (see below), whose sum is σ = 222000. Its totient is φ = 219384.

The previous prime is 220687. The next prime is 220699. The reversal of 220691 is 196022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196022 = 298011.

It is a cyclic number.

It is not a de Polignac number, because 220691 - 22 = 220687 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 220691.

It is not an unprimeable number, because it can be changed into a prime (220699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356 + ... + 753.

It is an arithmetic number, because the mean of its divisors is an integer number (55500).

2220691 is an apocalyptic number.

220691 is a deficient number, since it is larger than the sum of its proper divisors (1309).

220691 is a wasteful number, since it uses less digits than its factorization.

220691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 220691 is about 469.7776069589. Note that the first 3 decimals coincide. The cubic root of 220691 is about 60.4312448900.

The spelling of 220691 in words is "two hundred twenty thousand, six hundred ninety-one".

Divisors: 1 199 1109 220691