6621251 has 24 divisors (see below), whose sum is σ = 8520480. Its totient is φ = 5031936.

The previous prime is 6621239. The next prime is 6621281. The reversal of 6621251 is 1521266.

It is not a de Polignac number, because 6621251 - 2¹⁴ = 6604867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6621281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34211 + ... + 34403.

It is an arithmetic number, because the mean of its divisors is an integer number (355020).

Almost surely, 2^6621251 is an apocalyptic number.

6621251 is a deficient number, since it is larger than the sum of its proper divisors (1899229).

6621251 is a wasteful number, since it uses less digits than its factorization.

6621251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 242 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 6621251 is about 2573.1791620484. The cubic root of 6621251 is about 187.7788538181.

The spelling of 6621251 in words is "six million, six hundred twenty-one thousand, two hundred fifty-one".