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131231010023 = 1631979194447
BaseRepresentation
bin111101000110111111…
…0100100110011100111
3110112201201022000220122
41322031332210303213
54122230114310043
6140141531552155
712324012115601
oct1721576446347
9415651260818
10131231010023
1150722536193
1221524bbb65b
13c4b4c35929
1464ccb8c171
153630e77368
hex1e8dfa4ce7

131231010023 has 16 divisors (see below), whose sum is σ = 132880619520. Its totient is φ = 129593501856.

The previous prime is 131231010019. The next prime is 131231010091. The reversal of 131231010023 is 320010132131.

It is a cyclic number.

It is not a de Polignac number, because 131231010023 - 22 = 131231010019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131231009983 and 131231010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131231010223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29507786 + ... + 29512232.

It is an arithmetic number, because the mean of its divisors is an integer number (8305038720).

Almost surely, 2131231010023 is an apocalyptic number.

131231010023 is a deficient number, since it is larger than the sum of its proper divisors (1649609497).

131231010023 is a wasteful number, since it uses less digits than its factorization.

131231010023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5726.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 131231010023 its reverse (320010132131), we get a palindrome (451241142154).

The spelling of 131231010023 in words is "one hundred thirty-one billion, two hundred thirty-one million, ten thousand, twenty-three".

Divisors: 1 163 197 919 4447 32111 149797 181043 724861 876059 4086793 29510009 142797617 666147259 805098221 131231010023