6985981 has 2 divisors, whose sum is σ = 6985982. Its totient is φ = 6985980.

The previous prime is 6985973. The next prime is 6986011. The reversal of 6985981 is 1895896.

6985981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4708900 + 2277081 = 2170^2 + 1509^2 .

It is a cyclic number.

It is not a de Polignac number, because 6985981 - 2³ = 6985973 is a prime.

It is a super-2 number, since 2×6985981² = 97607861064722, which contains 22 as substring.

6985981 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6985931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3492990 + 3492991.

It is an arithmetic number, because the mean of its divisors is an integer number (3492991).

Almost surely, 2^6985981 is an apocalyptic number.

It is an amenable number.

6985981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6985981 is an equidigital number, since it uses as much as digits as its factorization.

6985981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 46.

The square root of 6985981 is about 2643.1006412923. The cubic root of 6985981 is about 191.1653311119.

The spelling of 6985981 in words is "six million, nine hundred eighty-five thousand, nine hundred eighty-one".