6984532781 has 2 divisors, whose sum is σ = 6984532782. Its totient is φ = 6984532780.

The previous prime is 6984532769. The next prime is 6984532801. The reversal of 6984532781 is 1872354896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5496887881 + 1487644900 = 74141^2 + 38570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6984532781 is a prime.

It is a super-2 number, since 2×6984532781² = 97567396337727187922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6984532721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3492266390 + 3492266391.

It is an arithmetic number, because the mean of its divisors is an integer number (3492266391).

Almost surely, 2^6984532781 is an apocalyptic number.

It is an amenable number.

6984532781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6984532781 is an equidigital number, since it uses as much as digits as its factorization.

6984532781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 53.

The square root of 6984532781 is about 83573.5172228619. The cubic root of 6984532781 is about 1911.5212044534.

The spelling of 6984532781 in words is "six billion, nine hundred eighty-four million, five hundred thirty-two thousand, seven hundred eighty-one".