3825581 has 6 divisors (see below), whose sum is σ = 3918510. Its totient is φ = 3734808.

The previous prime is 3825559. The next prime is 3825599. The reversal of 3825581 is 1855283.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2669956 + 1155625 = 1634^2 + 1075^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3825581 is a prime.

It is a super-2 number, since 2×3825581² = 29270139975122, 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 (3825511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 815 + ... + 2883.

It is an arithmetic number, because the mean of its divisors is an integer number (653085).

Almost surely, 2^3825581 is an apocalyptic number.

It is an amenable number.

3825581 is a deficient number, since it is larger than the sum of its proper divisors (92929).

3825581 is an equidigital number, since it uses as much as digits as its factorization.

3825581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155 (or 2112 counting only the distinct ones).

The product of its digits is 9600, while the sum is 32.

The square root of 3825581 is about 1955.9092514736. The cubic root of 3825581 is about 156.3984581538.

The spelling of 3825581 in words is "three million, eight hundred twenty-five thousand, five hundred eighty-one".