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6868981 = 7981283
BaseRepresentation
bin11010001100111111110101
3110220222110201
4122030333311
53224301411
6403120501
7112246120
oct32147765
913828421
106868981
113971849
122373131
1315666b2
14cab3b7
1590a3c1
hex68cff5

6868981 has 4 divisors (see below), whose sum is σ = 7850272. Its totient is φ = 5887692.

The previous prime is 6868921. The next prime is 6868987. The reversal of 6868981 is 1898686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6868981 - 211 = 6866933 is a prime.

It is a super-2 number, since 2×68689812 = 94365799956722, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6868987) 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, 490635 + ... + 490648.

It is an arithmetic number, because the mean of its divisors is an integer number (1962568).

Almost surely, 26868981 is an apocalyptic number.

It is an amenable number.

6868981 is a deficient number, since it is larger than the sum of its proper divisors (981291).

6868981 is an equidigital number, since it uses as much as digits as its factorization.

6868981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981290.

The product of its digits is 165888, while the sum is 46.

The square root of 6868981 is about 2620.8740908331. The cubic root of 6868981 is about 190.0921159978.

The spelling of 6868981 in words is "six million, eight hundred sixty-eight thousand, nine hundred eighty-one".

Divisors: 1 7 981283 6868981