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640101 = 371117163
BaseRepresentation
bin10011100010001100101
31012112001110
42130101211
5130440401
621415233
75304120
oct2342145
91175043
10640101
113a7a10
1226a519
13195477
141293b7
15c99d6
hex9c465

640101 has 32 divisors (see below), whose sum is σ = 1133568. Its totient is φ = 311040.

The previous prime is 640099. The next prime is 640109. The reversal of 640101 is 101046.

It is not a de Polignac number, because 640101 - 21 = 640099 is a prime.

640101 is a modest number, since divided by 101 gives 64 as remainder.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640101.

It is not an unprimeable number, because it can be changed into a prime (640109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3846 + ... + 4008.

It is an arithmetic number, because the mean of its divisors is an integer number (35424).

2640101 is an apocalyptic number.

It is an amenable number.

640101 is a deficient number, since it is larger than the sum of its proper divisors (493467).

640101 is a wasteful number, since it uses less digits than its factorization.

640101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 640101 is about 800.0631225097. The cubic root of 640101 is about 86.1819206525.

Adding to 640101 its reverse (101046), we get a palindrome (741147).

It can be divided in two parts, 640 and 101, that added together give a triangular number (741 = T38).

The spelling of 640101 in words is "six hundred forty thousand, one hundred one".

Divisors: 1 3 7 11 17 21 33 51 77 119 163 187 231 357 489 561 1141 1309 1793 2771 3423 3927 5379 8313 12551 19397 30481 37653 58191 91443 213367 640101