6990871 has 2 divisors, whose sum is σ = 6990872. Its totient is φ = 6990870.

The previous prime is 6990857. The next prime is 6990881. The reversal of 6990871 is 1780996.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6990871 - 2⁵ = 6990839 is a prime.

6990871 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6990821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495435 + 3495436.

It is an arithmetic number, because the mean of its divisors is an integer number (3495436).

Almost surely, 2^6990871 is an apocalyptic number.

6990871 is a deficient number, since it is larger than the sum of its proper divisors (1).

6990871 is an equidigital number, since it uses as much as digits as its factorization.

6990871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 6990871 is about 2644.0255293775. The cubic root of 6990871 is about 191.2099242498.

The spelling of 6990871 in words is "six million, nine hundred ninety thousand, eight hundred seventy-one".