3621802409 has 4 divisors (see below), whose sum is σ = 3706030416. Its totient is φ = 3537574404.

The previous prime is 3621802403. The next prime is 3621802411. The reversal of 3621802409 is 9042081263.

3621802409 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9042081263 = 57077 ⋅158419.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3621802409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3621802403) 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, 42113939 + ... + 42114024.

It is an arithmetic number, because the mean of its divisors is an integer number (926507604).

Almost surely, 2^3621802409 is an apocalyptic number.

It is an amenable number.

3621802409 is a deficient number, since it is larger than the sum of its proper divisors (84228007).

3621802409 is an equidigital number, since it uses as much as digits as its factorization.

3621802409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84228006.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 3621802409 is about 60181.4124875779. The cubic root of 3621802409 is about 1535.7066012284.

The spelling of 3621802409 in words is "three billion, six hundred twenty-one million, eight hundred two thousand, four hundred nine".