6432581 has 4 divisors (see below), whose sum is σ = 6440064. Its totient is φ = 6425100.

The previous prime is 6432563. The next prime is 6432599. The reversal of 6432581 is 1852346.

6432581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (6432563) and next prime (6432599).

It is a cyclic number.

It is not a de Polignac number, because 6432581 - 2¹⁴ = 6416197 is a prime.

It is a super-2 number, since 2×6432581² = 82756196643122, 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 (6432551) 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, 2255 + ... + 4236.

It is an arithmetic number, because the mean of its divisors is an integer number (1610016).

Almost surely, 2^6432581 is an apocalyptic number.

It is an amenable number.

6432581 is a deficient number, since it is larger than the sum of its proper divisors (7483).

6432581 is an equidigital number, since it uses as much as digits as its factorization.

6432581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7482.

The product of its digits is 5760, while the sum is 29.

The square root of 6432581 is about 2536.2533390811. The cubic root of 6432581 is about 185.9780777339.

The spelling of 6432581 in words is "six million, four hundred thirty-two thousand, five hundred eighty-one".