6989791 has 2 divisors, whose sum is σ = 6989792. Its totient is φ = 6989790.

The previous prime is 6989761. The next prime is 6989809. The reversal of 6989791 is 1979896.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6989791 - 2¹³ = 6981599 is a prime.

6989791 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6989761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494895 + 3494896.

It is an arithmetic number, because the mean of its divisors is an integer number (3494896).

Almost surely, 2^6989791 is an apocalyptic number.

6989791 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989791 is an equidigital number, since it uses as much as digits as its factorization.

6989791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 49.

The square root of 6989791 is about 2643.8212874550. The cubic root of 6989791 is about 191.2000772483.

The spelling of 6989791 in words is "six million, nine hundred eighty-nine thousand, seven hundred ninety-one".