6425581 has 4 divisors (see below), whose sum is σ = 6435964. Its totient is φ = 6415200.

The previous prime is 6425567. The next prime is 6425593. The reversal of 6425581 is 1855246.

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 2223081 + 4202500 = 1491^2 + 2050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6425581 is a prime.

It is a super-2 number, since 2×6425581² = 82576182375122, 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 (6425521) 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, 4200 + ... + 5521.

It is an arithmetic number, because the mean of its divisors is an integer number (1608991).

Almost surely, 2^6425581 is an apocalyptic number.

It is an amenable number.

6425581 is a deficient number, since it is larger than the sum of its proper divisors (10383).

6425581 is an equidigital number, since it uses as much as digits as its factorization.

6425581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10382.

The product of its digits is 9600, while the sum is 31.

The square root of 6425581 is about 2534.8729751212. The cubic root of 6425581 is about 185.9105921705.

The spelling of 6425581 in words is "six million, four hundred twenty-five thousand, five hundred eighty-one".