6706991 has 4 divisors (see below), whose sum is σ = 6833592. Its totient is φ = 6580392.

The previous prime is 6706969. The next prime is 6707017. The reversal of 6706991 is 1996076.

6706991 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.

It is a cyclic number.

It is not a de Polignac number, because 6706991 - 2⁶ = 6706927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6706591) 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, 63221 + ... + 63326.

It is an arithmetic number, because the mean of its divisors is an integer number (1708398).

Almost surely, 2^6706991 is an apocalyptic number.

6706991 is a deficient number, since it is larger than the sum of its proper divisors (126601).

6706991 is a wasteful number, since it uses less digits than its factorization.

6706991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126600.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 6706991 is about 2589.7858984866. The cubic root of 6706991 is about 188.5859097552.

Subtracting from 6706991 its sum of digits (38), we obtain a triangular number (6706953 = T₃₆₆₂).

Subtracting from 6706991 its reverse (1996076), we obtain a triangular number (4710915 = T₃₀₆₉).

The spelling of 6706991 in words is "six million, seven hundred six thousand, nine hundred ninety-one".