6405091 has 16 divisors (see below), whose sum is σ = 8045568. Its totient is φ = 4953600.

The previous prime is 6405089. The next prime is 6405101. The reversal of 6405091 is 1905046.

It is a cyclic number.

It is not a de Polignac number, because 6405091 - 2¹ = 6405089 is a prime.

It is a Duffinian number.

6405091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6405011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14646 + ... + 15076.

It is an arithmetic number, because the mean of its divisors is an integer number (502848).

Almost surely, 2^6405091 is an apocalyptic number.

6405091 is a deficient number, since it is larger than the sum of its proper divisors (1640477).

6405091 is a wasteful number, since it uses less digits than its factorization.

6405091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 6405091 is about 2530.8281253376. The cubic root of 6405091 is about 185.7127701482.

The spelling of 6405091 in words is "six million, four hundred five thousand, ninety-one".