6256421 has 2 divisors, whose sum is σ = 6256422. Its totient is φ = 6256420.

The previous prime is 6256409. The next prime is 6256427. The reversal of 6256421 is 1246526.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5827396 + 429025 = 2414^2 + 655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6256421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6256427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3128210 + 3128211.

It is an arithmetic number, because the mean of its divisors is an integer number (3128211).

Almost surely, 2^6256421 is an apocalyptic number.

It is an amenable number.

6256421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6256421 is an equidigital number, since it uses as much as digits as its factorization.

6256421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 26.

The square root of 6256421 is about 2501.2838703354. The cubic root of 6256421 is about 184.2646337856.

The spelling of 6256421 in words is "six million, two hundred fifty-six thousand, four hundred twenty-one".