6991841 has 2 divisors, whose sum is σ = 6991842. Its totient is φ = 6991840.

The previous prime is 6991823. The next prime is 6991847. The reversal of 6991841 is 1481996.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6145441 + 846400 = 2479^2 + 920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6991841 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6991795 and 6991804.

It is not a weakly prime, because it can be changed into another prime (6991847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495920 + 3495921.

It is an arithmetic number, because the mean of its divisors is an integer number (3495921).

Almost surely, 2^6991841 is an apocalyptic number.

It is an amenable number.

6991841 is a deficient number, since it is larger than the sum of its proper divisors (1).

6991841 is an equidigital number, since it uses as much as digits as its factorization.

6991841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 6991841 is about 2644.2089554345. The cubic root of 6991841 is about 191.2187674516.

The spelling of 6991841 in words is "six million, nine hundred ninety-one thousand, eight hundred forty-one".