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230151221 = 299781817
BaseRepresentation
bin11011011011111…
…01010000110101
3121001001220010022
431231331100311
5432404314341
634500534525
75463152546
oct1555752065
9531056108
10230151221
11108a07023
12650b1445
13388b3071
14227d04cd
1515312e4b
hexdb7d435

230151221 has 8 divisors (see below), whose sum is σ = 240544920. Its totient is φ = 219921408.

The previous prime is 230151203. The next prime is 230151227. The reversal of 230151221 is 122151032.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1234321 + 228916900 = 1111^2 + 15130^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 230151221 - 214 = 230134837 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 230151221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (230151227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38096 + ... + 43721.

It is an arithmetic number, because the mean of its divisors is an integer number (30068115).

Almost surely, 2230151221 is an apocalyptic number.

It is an amenable number.

230151221 is a deficient number, since it is larger than the sum of its proper divisors (10393699).

230151221 is an equidigital number, since it uses as much as digits as its factorization.

230151221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81943.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 230151221 is about 15170.7356776130. The cubic root of 230151221 is about 612.8268163409.

The spelling of 230151221 in words is "two hundred thirty million, one hundred fifty-one thousand, two hundred twenty-one".

Divisors: 1 29 97 2813 81817 2372693 7936249 230151221