6390581 has 4 divisors (see below), whose sum is σ = 6511212. Its totient is φ = 6269952.

The previous prime is 6390577. The next prime is 6390583. The reversal of 6390581 is 1850936.

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 2430481 + 3960100 = 1559^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 6390581 - 2² = 6390577 is a prime.

It is a super-2 number, since 2×6390581² = 81679051035122, 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 (6390583) 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, 60236 + ... + 60341.

It is an arithmetic number, because the mean of its divisors is an integer number (1627803).

Almost surely, 2^6390581 is an apocalyptic number.

It is an amenable number.

6390581 is a deficient number, since it is larger than the sum of its proper divisors (120631).

6390581 is a wasteful number, since it uses less digits than its factorization.

6390581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120630.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 6390581 is about 2527.9598493647. The cubic root of 6390581 is about 185.5724271149.

The spelling of 6390581 in words is "six million, three hundred ninety thousand, five hundred eighty-one".