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1281231 = 3376779
BaseRepresentation
bin100111000110011001111
32102002112000
410320303033
5311444411
643243343
713614240
oct4706317
92362460
101281231
117a5676
12519553
1335b233
14254cc7
151a4956
hex138ccf

1281231 has 16 divisors (see below), whose sum is σ = 2169600. Its totient is φ = 732024.

The previous prime is 1281229. The next prime is 1281253. The reversal of 1281231 is 1321821.

It is not a de Polignac number, because 1281231 - 21 = 1281229 is a prime.

It is a super-2 number, since 2×12812312 = 3283105750722, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3201 + ... + 3578.

It is an arithmetic number, because the mean of its divisors is an integer number (135600).

21281231 is an apocalyptic number.

1281231 is a deficient number, since it is larger than the sum of its proper divisors (888369).

1281231 is an equidigital number, since it uses as much as digits as its factorization.

1281231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6795 (or 6789 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1281231 is about 1131.9147494401. The cubic root of 1281231 is about 108.6115002625.

The spelling of 1281231 in words is "one million, two hundred eighty-one thousand, two hundred thirty-one".

Divisors: 1 3 7 9 21 27 63 189 6779 20337 47453 61011 142359 183033 427077 1281231