6413581 has 4 divisors (see below), whose sum is σ = 6422652. Its totient is φ = 6404512.

The previous prime is 6413569. The next prime is 6413591. The reversal of 6413581 is 1853146.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3740356 + 2673225 = 1934^2 + 1635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6413581 is a prime.

It is a super-2 number, since 2×6413581² = 82268042487122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6413531) 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, 3376 + ... + 4921.

It is an arithmetic number, because the mean of its divisors is an integer number (1605663).

Almost surely, 2^6413581 is an apocalyptic number.

It is an amenable number.

6413581 is a deficient number, since it is larger than the sum of its proper divisors (9071).

6413581 is an equidigital number, since it uses as much as digits as its factorization.

6413581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9070.

The product of its digits is 2880, while the sum is 28.

The square root of 6413581 is about 2532.5048864711. The cubic root of 6413581 is about 185.7947885139.

The spelling of 6413581 in words is "six million, four hundred thirteen thousand, five hundred eighty-one".