6989491 has 2 divisors, whose sum is σ = 6989492. Its totient is φ = 6989490.

The previous prime is 6989461. The next prime is 6989497. The reversal of 6989491 is 1949896.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6989491 - 2⁵ = 6989459 is a prime.

It is not a weakly prime, because it can be changed into another prime (6989497) 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, 3494745 + 3494746.

It is an arithmetic number, because the mean of its divisors is an integer number (3494746).

Almost surely, 2^6989491 is an apocalyptic number.

6989491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989491 is an equidigital number, since it uses as much as digits as its factorization.

6989491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 46.

The square root of 6989491 is about 2643.7645507874. The cubic root of 6989491 is about 191.1973417900.

The spelling of 6989491 in words is "six million, nine hundred eighty-nine thousand, four hundred ninety-one".