6751981 has 2 divisors, whose sum is σ = 6751982. Its totient is φ = 6751980.

The previous prime is 6751963. The next prime is 6751991. The reversal of 6751981 is 1891576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6734025 + 17956 = 2595^2 + 134^2 .

It is a cyclic number.

It is not a de Polignac number, because 6751981 - 2⁷ = 6751853 is a prime.

It is a super-2 number, since 2×6751981² = 91178494848722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6751981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6751931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3375990 + 3375991.

It is an arithmetic number, because the mean of its divisors is an integer number (3375991).

Almost surely, 2^6751981 is an apocalyptic number.

It is an amenable number.

6751981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6751981 is an equidigital number, since it uses as much as digits as its factorization.

6751981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 37.

The square root of 6751981 is about 2598.4574270132. The cubic root of 6751981 is about 189.0066438507.

It can be divided in two parts, 67519 and 81, that added together give a square (67600 = 260²).

The spelling of 6751981 in words is "six million, seven hundred fifty-one thousand, nine hundred eighty-one".