3648581 has 2 divisors, whose sum is σ = 3648582. Its totient is φ = 3648580.

The previous prime is 3648553. The next prime is 3648587. The reversal of 3648581 is 1858463.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2512225 + 1136356 = 1585^2 + 1066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3648581 is a prime.

It is a super-2 number, since 2×3648581² = 26624286627122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3648587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1824290 + 1824291.

It is an arithmetic number, because the mean of its divisors is an integer number (1824291).

Almost surely, 2^3648581 is an apocalyptic number.

It is an amenable number.

3648581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3648581 is an equidigital number, since it uses as much as digits as its factorization.

3648581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 35.

The square root of 3648581 is about 1910.1259120801. The cubic root of 3648581 is about 153.9482172557.

The spelling of 3648581 in words is "three million, six hundred forty-eight thousand, five hundred eighty-one".