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680107181 = 1352315937
BaseRepresentation
bin101000100010011…
…001110010101101
31202101202000122212
4220202121302231
52343101412211
6151253020205
722565546525
oct5042316255
91671660585
10680107181
113199a2656
1216b924665
13aab959b0
146647a685
153ea9338b
hex28899cad

680107181 has 4 divisors (see below), whose sum is σ = 732423132. Its totient is φ = 627791232.

The previous prime is 680107157. The next prime is 680107189. The reversal of 680107181 is 181701086.

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 264355081 + 415752100 = 16259^2 + 20390^2 .

It is a cyclic number.

It is not a de Polignac number, because 680107181 - 218 = 679845037 is a prime.

It is a super-2 number, since 2×6801071812 = 925091555295533522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680107189) 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, 26157956 + ... + 26157981.

It is an arithmetic number, because the mean of its divisors is an integer number (183105783).

Almost surely, 2680107181 is an apocalyptic number.

It is an amenable number.

680107181 is a deficient number, since it is larger than the sum of its proper divisors (52315951).

680107181 is a wasteful number, since it uses less digits than its factorization.

680107181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52315950.

The product of its (nonzero) digits is 2688, while the sum is 32.

The square root of 680107181 is about 26078.8646416979. The cubic root of 680107181 is about 879.4121336320.

The spelling of 680107181 in words is "six hundred eighty million, one hundred seven thousand, one hundred eighty-one".

Divisors: 1 13 52315937 680107181