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1312009 = 17711087
BaseRepresentation
bin101000000010100001001
32110122201221
411000110021
5313441014
644042041
714103046
oct5002411
92418657
101312009
11816806
12533321
1336c24a
142621cd
151adb24
hex140509

1312009 has 8 divisors (see below), whose sum is σ = 1410048. Its totient is φ = 1216320.

The previous prime is 1312001. The next prime is 1312019. The reversal of 1312009 is 9002131.

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 1312009 - 23 = 1312001 is a prime.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 1311983 and 1312001.

It is not an unprimeable number, because it can be changed into a prime (1312001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 664 + ... + 1750.

It is an arithmetic number, because the mean of its divisors is an integer number (176256).

21312009 is an apocalyptic number.

It is an amenable number.

1312009 is a deficient number, since it is larger than the sum of its proper divisors (98039).

1312009 is a wasteful number, since it uses less digits than its factorization.

1312009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1312009 is about 1145.4296137258. The cubic root of 1312009 is about 109.4743238172.

The spelling of 1312009 in words is "one million, three hundred twelve thousand, nine".

Divisors: 1 17 71 1087 1207 18479 77177 1312009