6781750421 has 2 divisors, whose sum is σ = 6781750422. Its totient is φ = 6781750420.

The previous prime is 6781750361. The next prime is 6781750439. The reversal of 6781750421 is 1240571876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3845736196 + 2936014225 = 62014^2 + 54185^2 .

It is a cyclic number.

It is not a de Polignac number, because 6781750421 - 2³⁰ = 5708008597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6781750121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3390875210 + 3390875211.

It is an arithmetic number, because the mean of its divisors is an integer number (3390875211).

Almost surely, 2^6781750421 is an apocalyptic number.

It is an amenable number.

6781750421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6781750421 is an equidigital number, since it uses as much as digits as its factorization.

6781750421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 6781750421 is about 82351.3838438675. The cubic root of 6781750421 is about 1892.8401278446.

The spelling of 6781750421 in words is "six billion, seven hundred eighty-one million, seven hundred fifty thousand, four hundred twenty-one".