6991693 has 2 divisors, whose sum is σ = 6991694. Its totient is φ = 6991692.

The previous prime is 6991687. The next prime is 6991711. The reversal of 6991693 is 3961996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6240004 + 751689 = 2498^2 + 867^2 .

It is a cyclic number.

It is not a de Polignac number, because 6991693 - 2²¹ = 4894541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6991603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495846 + 3495847.

It is an arithmetic number, because the mean of its divisors is an integer number (3495847).

Almost surely, 2^6991693 is an apocalyptic number.

It is an amenable number.

6991693 is a deficient number, since it is larger than the sum of its proper divisors (1).

6991693 is an equidigital number, since it uses as much as digits as its factorization.

6991693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 43.

The square root of 6991693 is about 2644.1809696010. The cubic root of 6991693 is about 191.2174182325.

The spelling of 6991693 in words is "six million, nine hundred ninety-one thousand, six hundred ninety-three".