3251581 has 4 divisors (see below), whose sum is σ = 3277312. Its totient is φ = 3225852.

The previous prime is 3251569. The next prime is 3251593. The reversal of 3251581 is 1851523.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (3251569) and next prime (3251593).

It is a cyclic number.

It is not a de Polignac number, because 3251581 - 2⁷ = 3251453 is a prime.

It is a super-2 number, since 2×3251581² = 21145557999122, 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 (3251681) 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, 12675 + ... + 12928.

It is an arithmetic number, because the mean of its divisors is an integer number (819328).

Almost surely, 2^3251581 is an apocalyptic number.

It is an amenable number.

3251581 is a deficient number, since it is larger than the sum of its proper divisors (25731).

3251581 is a wasteful number, since it uses less digits than its factorization.

3251581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25730.

The product of its digits is 1200, while the sum is 25.

The square root of 3251581 is about 1803.2140749229. The cubic root of 3251581 is about 148.1488185332.

The spelling of 3251581 in words is "three million, two hundred fifty-one thousand, five hundred eighty-one".