6255621 has 6 divisors (see below), whose sum is σ = 9035910. Its totient is φ = 4170408.

The previous prime is 6255607. The next prime is 6255629. The reversal of 6255621 is 1265526.

It can be written as a sum of positive squares in only one way, i.e., 4536900 + 1718721 = 2130^2 + 1311^2 .

It is not a de Polignac number, because 6255621 - 2¹¹ = 6253573 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6255629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 347526 + ... + 347543.

It is an arithmetic number, because the mean of its divisors is an integer number (1505985).

Almost surely, 2^6255621 is an apocalyptic number.

It is an amenable number.

6255621 is a deficient number, since it is larger than the sum of its proper divisors (2780289).

6255621 is a wasteful number, since it uses less digits than its factorization.

6255621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695075 (or 695072 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 6255621 is about 2501.1239473485. The cubic root of 6255621 is about 184.2567795619.

The spelling of 6255621 in words is "six million, two hundred fifty-five thousand, six hundred twenty-one".