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2131001111 = 6449330439
BaseRepresentation
bin111111100000100…
…0111111100010111
312111111212001222002
41333001013330113
513331014013421
6551242425515
7103544132141
oct17701077427
95444761862
102131001111
119a3992748
124b580229b
1327c653705
14163039c91
15c713cb0b
hex7f047f17

2131001111 has 4 divisors (see below), whose sum is σ = 2131338000. Its totient is φ = 2130664224.

The previous prime is 2131001099. The next prime is 2131001141. The reversal of 2131001111 is 1111001312.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-2131001111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2131001092 and 2131001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131001141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158771 + ... + 171668.

It is an arithmetic number, because the mean of its divisors is an integer number (532834500).

Almost surely, 22131001111 is an apocalyptic number.

2131001111 is a deficient number, since it is larger than the sum of its proper divisors (336889).

2131001111 is an equidigital number, since it uses as much as digits as its factorization.

2131001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336888.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 2131001111 is about 46162.7675838440. The cubic root of 2131001111 is about 1286.8498967745.

Adding to 2131001111 its reverse (1111001312), we get a palindrome (3242002423).

The spelling of 2131001111 in words is "two billion, one hundred thirty-one million, one thousand, one hundred eleven".

Divisors: 1 6449 330439 2131001111