6981993 has 6 divisors (see below), whose sum is σ = 10085114. Its totient is φ = 4654656.

The previous prime is 6981983. The next prime is 6982009. The reversal of 6981993 is 3991896.

It can be written as a sum of positive squares in only one way, i.e., 6953769 + 28224 = 2637^2 + 168^2 .

It is not a de Polignac number, because 6981993 - 2⁴ = 6981977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6981943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 387880 + ... + 387897.

Almost surely, 2^6981993 is an apocalyptic number.

It is an amenable number.

6981993 is a deficient number, since it is larger than the sum of its proper divisors (3103121).

6981993 is a wasteful number, since it uses less digits than its factorization.

6981993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775783 (or 775780 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 6981993 is about 2642.3461166168. The cubic root of 6981993 is about 191.1289481303.

The spelling of 6981993 in words is "six million, nine hundred eighty-one thousand, nine hundred ninety-three".