6465581 has 2 divisors, whose sum is σ = 6465582. Its totient is φ = 6465580.

The previous prime is 6465551. The next prime is 6465587. The reversal of 6465581 is 1855646.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5593225 + 872356 = 2365^2 + 934^2 .

It is a cyclic number.

It is not a de Polignac number, because 6465581 - 2¹⁴ = 6449197 is a prime.

It is a super-2 number, since 2×6465581² = 83607475335122, which contains 22 as substring.

It is a Chen prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6465587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3232790 + 3232791.

It is an arithmetic number, because the mean of its divisors is an integer number (3232791).

Almost surely, 2^6465581 is an apocalyptic number.

It is an amenable number.

6465581 is a deficient number, since it is larger than the sum of its proper divisors (1).

6465581 is an equidigital number, since it uses as much as digits as its factorization.

6465581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The square root of 6465581 is about 2542.7506759413. The cubic root of 6465581 is about 186.2955662277.

The spelling of 6465581 in words is "six million, four hundred sixty-five thousand, five hundred eighty-one".