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6981869 = 67104207

6981869 has 4 divisors (see below), whose sum is σ = 7086144. Its totient is φ = 6877596.

The previous prime is 6981859. The next prime is 6981889. The reversal of 6981869 is 9681896.

6981869 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6981869 - 24 = 6981853 is a prime.

It is a super-2 number, since 2×69818692 = 97492989466322, which contains 22 as substring.

6981869 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6981829) 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, 52037 + ... + 52170.

It is an arithmetic number, because the mean of its divisors is an integer number (1771536).

Almost surely, 26981869 is an apocalyptic number.

It is an amenable number.

6981869 is a deficient number, since it is larger than the sum of its proper divisors (104275).

6981869 is a wasteful number, since it uses less digits than its factorization.

6981869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104274.

The product of its digits is 186624, while the sum is 47.

The square root of 6981869 is about 2642.3226525162. The cubic root of 6981869 is about 191.1278166421.

The spelling of 6981869 in words is "six million, nine hundred eighty-one thousand, eight hundred sixty-nine".

Divisors: 1 67 104207 6981869