6861997 has 2 divisors, whose sum is σ = 6861998. Its totient is φ = 6861996.

The previous prime is 6861977. The next prime is 6862001. The reversal of 6861997 is 7991686.

6861997 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6120676 + 741321 = 2474^2 + 861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6861997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6861947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3430998 + 3430999.

It is an arithmetic number, because the mean of its divisors is an integer number (3430999).

Almost surely, 2^6861997 is an apocalyptic number.

It is an amenable number.

6861997 is a deficient number, since it is larger than the sum of its proper divisors (1).

6861997 is an equidigital number, since it uses as much as digits as its factorization.

6861997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 46.

The square root of 6861997 is about 2619.5413720726. The cubic root of 6861997 is about 190.0276691006.

It can be divided in two parts, 686199 and 7, that added together give a triangular number (686206 = T₁₁₇₁).

The spelling of 6861997 in words is "six million, eight hundred sixty-one thousand, nine hundred ninety-seven".