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1220231 = 1518081
BaseRepresentation
bin100101001111010000111
32021222211202
410221322013
5303021411
642053115
713241345
oct4517207
92258752
101220231
11763861
124aa19b
1333953c
1423a995
1519183b
hex129e87

1220231 has 4 divisors (see below), whose sum is σ = 1228464. Its totient is φ = 1212000.

The previous prime is 1220203. The next prime is 1220239. The reversal of 1220231 is 1320221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1320221 = 7188603.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1220231 is a prime.

It is a super-2 number, since 2×12202312 = 2977927386722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220239) 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, 3890 + ... + 4191.

It is an arithmetic number, because the mean of its divisors is an integer number (307116).

21220231 is an apocalyptic number.

1220231 is a deficient number, since it is larger than the sum of its proper divisors (8233).

1220231 is an equidigital number, since it uses as much as digits as its factorization.

1220231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8232.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1220231 is about 1104.6406655560. The cubic root of 1220231 is about 106.8597165884.

Adding to 1220231 its reverse (1320221), we get a palindrome (2540452).

The spelling of 1220231 in words is "one million, two hundred twenty thousand, two hundred thirty-one".

Divisors: 1 151 8081 1220231