6990559 has 2 divisors, whose sum is σ = 6990560. Its totient is φ = 6990558.

The previous prime is 6990547. The next prime is 6990563. The reversal of 6990559 is 9550996.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6990559 - 2⁵ = 6990527 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6990059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495279 + 3495280.

It is an arithmetic number, because the mean of its divisors is an integer number (3495280).

Almost surely, 2^6990559 is an apocalyptic number.

6990559 is a deficient number, since it is larger than the sum of its proper divisors (1).

6990559 is an equidigital number, since it uses as much as digits as its factorization.

6990559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 109350, while the sum is 43.

The square root of 6990559 is about 2643.9665277760. The cubic root of 6990559 is about 191.2070796647.

It can be divided in two parts, 6990 and 559, that multiplied together give a triangular number (3907410 = T₂₇₉₅).

The spelling of 6990559 in words is "six million, nine hundred ninety thousand, five hundred fifty-nine".