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256522121 = 1072397403
BaseRepresentation
bin11110100101000…
…11011110001001
3122212200200012022
433102203132021
51011132201441
641242054225
76233254622
oct1722433611
9585620168
10256522121
11121888959
1271aaa375
13411b724b
14260d6a49
15177c184b
hexf4a3789

256522121 has 4 divisors (see below), whose sum is σ = 258919632. Its totient is φ = 254124612.

The previous prime is 256522109. The next prime is 256522153. The reversal of 256522121 is 121225652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256522121 - 218 = 256259977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256522621) 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, 1198595 + ... + 1198808.

It is an arithmetic number, because the mean of its divisors is an integer number (64729908).

Almost surely, 2256522121 is an apocalyptic number.

It is an amenable number.

256522121 is a deficient number, since it is larger than the sum of its proper divisors (2397511).

256522121 is a wasteful number, since it uses less digits than its factorization.

256522121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397510.

The product of its digits is 2400, while the sum is 26.

The square root of 256522121 is about 16016.3079703158. The cubic root of 256522121 is about 635.3918023478.

Adding to 256522121 its reverse (121225652), we get a palindrome (377747773).

The spelling of 256522121 in words is "two hundred fifty-six million, five hundred twenty-two thousand, one hundred twenty-one".

Divisors: 1 107 2397403 256522121