6445191 has 4 divisors (see below), whose sum is σ = 8593592. Its totient is φ = 4296792.

The previous prime is 6445189. The next prime is 6445213. The reversal of 6445191 is 1915446.

It is a happy number.

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

It is not a de Polignac number, because 6445191 - 2¹ = 6445189 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 (6445151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1074196 + ... + 1074201.

It is an arithmetic number, because the mean of its divisors is an integer number (2148398).

Almost surely, 2^6445191 is an apocalyptic number.

6445191 is a deficient number, since it is larger than the sum of its proper divisors (2148401).

6445191 is a wasteful number, since it uses less digits than its factorization.

6445191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148400.

The product of its digits is 4320, while the sum is 30.

The square root of 6445191 is about 2538.7380723501. The cubic root of 6445191 is about 186.0995247228.

The spelling of 6445191 in words is "six million, four hundred forty-five thousand, one hundred ninety-one".