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111231311111 = 4337965910357
BaseRepresentation
bin110011110010111100…
…1110001110100000111
3101122002220100001200022
41213211321301310013
53310300203423421
6123033213005355
711015262354524
oct1474571616407
9348086301608
10111231311111
114319a1a23a8
121968318385b
13a64863506b
14555294414b
152d6026a7ab
hex19e5e71d07

111231311111 has 16 divisors (see below), whose sum is σ = 114302601600. Its totient is φ = 108183001248.

The previous prime is 111231311101. The next prime is 111231311119. The reversal of 111231311111 is 111113132111.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-111231311111 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 111231311111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111231311119) 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, 10734545 + ... + 10744901.

It is an arithmetic number, because the mean of its divisors is an integer number (7143912600).

Almost surely, 2111231311111 is an apocalyptic number.

111231311111 is a deficient number, since it is larger than the sum of its proper divisors (3071290489).

111231311111 is a wasteful number, since it uses less digits than its factorization.

111231311111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11438.

The product of its digits is 18, while the sum is 17.

Adding to 111231311111 its reverse (111113132111), we get a palindrome (222344443222).

The spelling of 111231311111 in words is "one hundred eleven billion, two hundred thirty-one million, three hundred eleven thousand, one hundred eleven".

Divisors: 1 43 379 659 10357 16297 28337 249761 445351 3925303 6825263 10739723 168788029 293486309 2586774677 111231311111