6989581 has 2 divisors, whose sum is σ = 6989582. Its totient is φ = 6989580.

The previous prime is 6989579. The next prime is 6989599. The reversal of 6989581 is 1859896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6456681 + 532900 = 2541^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 6989581 - 2¹ = 6989579 is a prime.

It is a super-2 number, since 2×6989581² = 97708485111122, which contains 22 as substring.

Together with 6989579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6989501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494790 + 3494791.

It is an arithmetic number, because the mean of its divisors is an integer number (3494791).

Almost surely, 2^6989581 is an apocalyptic number.

It is an amenable number.

6989581 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989581 is an equidigital number, since it uses as much as digits as its factorization.

6989581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 46.

The square root of 6989581 is about 2643.7815719155. The cubic root of 6989581 is about 191.1981624357.

The spelling of 6989581 in words is "six million, nine hundred eighty-nine thousand, five hundred eighty-one".