3650581 has 4 divisors (see below), whose sum is σ = 3982464. Its totient is φ = 3318700.

The previous prime is 3650579. The next prime is 3650593. The reversal of 3650581 is 1850563.

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 not a de Polignac number, because 3650581 - 2¹ = 3650579 is a prime.

It is a super-2 number, since 2×3650581² = 26653483275122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

3650581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3650501) 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, 165925 + ... + 165946.

It is an arithmetic number, because the mean of its divisors is an integer number (995616).

Almost surely, 2^3650581 is an apocalyptic number.

It is an amenable number.

3650581 is a deficient number, since it is larger than the sum of its proper divisors (331883).

3650581 is a wasteful number, since it uses less digits than its factorization.

3650581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331882.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 3650581 is about 1910.6493660533. The cubic root of 3650581 is about 153.9763414491.

The spelling of 3650581 in words is "three million, six hundred fifty thousand, five hundred eighty-one".