6905981 has 2 divisors, whose sum is σ = 6905982. Its totient is φ = 6905980.

The previous prime is 6905971. The next prime is 6906007. The reversal of 6905981 is 1895096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5040025 + 1865956 = 2245^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 6905981 - 2¹⁰ = 6904957 is a prime.

It is a super-2 number, since 2×6905981² = 95385147144722, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6905971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3452990 + 3452991.

It is an arithmetic number, because the mean of its divisors is an integer number (3452991).

Almost surely, 2^6905981 is an apocalyptic number.

It is an amenable number.

6905981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6905981 is an equidigital number, since it uses as much as digits as its factorization.

6905981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 6905981 is about 2627.9233246044. The cubic root of 6905981 is about 190.4328175460.

The spelling of 6905981 in words is "six million, nine hundred five thousand, nine hundred eighty-one".