6911987 has 2 divisors, whose sum is σ = 6911988. Its totient is φ = 6911986.

The previous prime is 6911969. The next prime is 6912011. The reversal of 6911987 is 7891196.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6911987 - 2⁸ = 6911731 is a prime.

It is not a weakly prime, because it can be changed into another prime (6911917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3455993 + 3455994.

It is an arithmetic number, because the mean of its divisors is an integer number (3455994).

Almost surely, 2^6911987 is an apocalyptic number.

6911987 is a deficient number, since it is larger than the sum of its proper divisors (1).

6911987 is an equidigital number, since it uses as much as digits as its factorization.

6911987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 41.

The square root of 6911987 is about 2629.0658036649. The cubic root of 6911987 is about 190.4880068136.

The spelling of 6911987 in words is "six million, nine hundred eleven thousand, nine hundred eighty-seven".