3641421581 has 4 divisors (see below), whose sum is σ = 4161624672. Its totient is φ = 3121218492.

The previous prime is 3641421557. The next prime is 3641421583. The reversal of 3641421581 is 1851241463.

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 3641421581 - 2¹⁴ = 3641405197 is a prime.

It is a super-3 number, since 3×3641421581³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3641421583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260101535 + ... + 260101548.

It is an arithmetic number, because the mean of its divisors is an integer number (1040406168).

Almost surely, 2^3641421581 is an apocalyptic number.

It is an amenable number.

3641421581 is a deficient number, since it is larger than the sum of its proper divisors (520203091).

3641421581 is an equidigital number, since it uses as much as digits as its factorization.

3641421581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520203090.

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

The square root of 3641421581 is about 60344.1926037626. The cubic root of 3641421581 is about 1538.4745648549.

The spelling of 3641421581 in words is "three billion, six hundred forty-one million, four hundred twenty-one thousand, five hundred eighty-one".