3701581 has 4 divisors (see below), whose sum is σ = 3986332. Its totient is φ = 3416832.

The previous prime is 3701557. The next prime is 3701587. The reversal of 3701581 is 1851073.

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 1713481 + 1988100 = 1309^2 + 1410^2 .

It is a cyclic number.

It is not a de Polignac number, because 3701581 - 2⁹ = 3701069 is a prime.

It is a super-2 number, since 2×3701581² = 27403403799122, which contains 22 as substring.

It is a Duffinian number.

3701581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3701587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142356 + ... + 142381.

It is an arithmetic number, because the mean of its divisors is an integer number (996583).

Almost surely, 2^3701581 is an apocalyptic number.

It is an amenable number.

3701581 is a deficient number, since it is larger than the sum of its proper divisors (284751).

3701581 is a wasteful number, since it uses less digits than its factorization.

3701581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284750.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 3701581 is about 1923.9493236569. The cubic root of 3701581 is about 154.6900639850.

The spelling of 3701581 in words is "three million, seven hundred one thousand, five hundred eighty-one".