6625191 has 4 divisors (see below), whose sum is σ = 8833592. Its totient is φ = 4416792.

The previous prime is 6625181. The next prime is 6625193. The reversal of 6625191 is 1915266.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6625191 - 2¹⁴ = 6608807 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6625193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1104196 + ... + 1104201.

It is an arithmetic number, because the mean of its divisors is an integer number (2208398).

Almost surely, 2^6625191 is an apocalyptic number.

6625191 is a deficient number, since it is larger than the sum of its proper divisors (2208401).

6625191 is a wasteful number, since it uses less digits than its factorization.

6625191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208400.

The product of its digits is 3240, while the sum is 30.

The square root of 6625191 is about 2573.9446380993. The cubic root of 6625191 is about 187.8160926008.

The spelling of 6625191 in words is "six million, six hundred twenty-five thousand, one hundred ninety-one".