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11123456789 = 13177844157
BaseRepresentation
bin10100101110000001…
…00111101100010101
31001201012202011010002
422113000213230111
5140240101104124
65035434141045
7542435552114
oct122700475425
931635664102
1011123456789
1147989a07a5
1221a5281785
131083691ac3
14777449c7b
154518290ae
hex297027b15

11123456789 has 4 divisors (see below), whose sum is σ = 11124314124. Its totient is φ = 11122599456.

The previous prime is 11123456759. The next prime is 11123456801. The reversal of 11123456789 is 98765432111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6706791025 + 4416665764 = 81895^2 + 66458^2 .

It is a cyclic number.

It is not a de Polignac number, because 11123456789 - 212 = 11123452693 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123456759) 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, 408902 + ... + 435255.

It is an arithmetic number, because the mean of its divisors is an integer number (2781078531).

Almost surely, 211123456789 is an apocalyptic number.

It is an amenable number.

11123456789 is a deficient number, since it is larger than the sum of its proper divisors (857335).

11123456789 is an equidigital number, since it uses as much as digits as its factorization.

11123456789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857334.

The product of its digits is 362880, while the sum is 47.

The spelling of 11123456789 in words is "eleven billion, one hundred twenty-three million, four hundred fifty-six thousand, seven hundred eighty-nine".

Divisors: 1 13177 844157 11123456789