6990691 has 2 divisors, whose sum is σ = 6990692. Its totient is φ = 6990690.

The previous prime is 6990679. The next prime is 6990701. The reversal of 6990691 is 1960996.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6990691 - 2⁷ = 6990563 is a prime.

It is not a weakly prime, because it can be changed into another prime (6990611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495345 + 3495346.

It is an arithmetic number, because the mean of its divisors is an integer number (3495346).

Almost surely, 2^6990691 is an apocalyptic number.

6990691 is a deficient number, since it is larger than the sum of its proper divisors (1).

6990691 is an equidigital number, since it uses as much as digits as its factorization.

6990691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 6990691 is about 2643.9914901527. The cubic root of 6990691 is about 191.2082831533.

The spelling of 6990691 in words is "six million, nine hundred ninety thousand, six hundred ninety-one".