6391145 has 8 divisors (see below), whose sum is σ = 7688904. Its totient is φ = 5099904.

The previous prime is 6391129. The next prime is 6391157. The reversal of 6391145 is 5411936.

It can be written as a sum of positive squares in 4 ways, for example, as 2347024 + 4044121 = 1532^2 + 2011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6391145 - 2⁴ = 6391129 is a prime.

It is a super-2 number, since 2×6391145² = 81693468822050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887 + ... + 3683.

It is an arithmetic number, because the mean of its divisors is an integer number (961113).

Almost surely, 2^6391145 is an apocalyptic number.

It is an amenable number.

6391145 is a deficient number, since it is larger than the sum of its proper divisors (1297759).

6391145 is a wasteful number, since it uses less digits than its factorization.

6391145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259.

The product of its digits is 3240, while the sum is 29.

The square root of 6391145 is about 2528.0713993082. The cubic root of 6391145 is about 185.5778861788.

The spelling of 6391145 in words is "six million, three hundred ninety-one thousand, one hundred forty-five".