6261821 has 2 divisors, whose sum is σ = 6261822. Its totient is φ = 6261820.

The previous prime is 6261817. The next prime is 6261823. The reversal of 6261821 is 1281626.

6261821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5812921 + 448900 = 2411^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 6261821 - 2² = 6261817 is a prime.

Together with 6261823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6261823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3130910 + 3130911.

It is an arithmetic number, because the mean of its divisors is an integer number (3130911).

Almost surely, 2^6261821 is an apocalyptic number.

It is an amenable number.

6261821 is a deficient number, since it is larger than the sum of its proper divisors (1).

6261821 is an equidigital number, since it uses as much as digits as its factorization.

6261821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 6261821 is about 2502.3630831676. The cubic root of 6261821 is about 184.3176322909.

The spelling of 6261821 in words is "six million, two hundred sixty-one thousand, eight hundred twenty-one".