3621553 has 4 divisors (see below), whose sum is σ = 3900148. Its totient is φ = 3342960.

The previous prime is 3621529. The next prime is 3621559. The reversal of 3621553 is 3551263.

It is a happy number.

3621553 is digitally balanced in base 2, because in such base 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 an emirpimes, since its reverse is a distinct semiprime: 3551263 = 191 ⋅18593.

It can be written as a sum of positive squares in 2 ways, for example, as 552049 + 3069504 = 743^2 + 1752^2 .

It is a cyclic number.

It is not a de Polignac number, because 3621553 - 2⁵ = 3621521 is a prime.

It is a super-2 number, since 2×3621553² = 26231292263618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3621559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139278 + ... + 139303.

It is an arithmetic number, because the mean of its divisors is an integer number (975037).

Almost surely, 2^3621553 is an apocalyptic number.

It is an amenable number.

3621553 is a deficient number, since it is larger than the sum of its proper divisors (278595).

3621553 is a wasteful number, since it uses less digits than its factorization.

3621553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278594.

The product of its digits is 2700, while the sum is 25.

The square root of 3621553 is about 1903.0378346213. The cubic root of 3621553 is about 153.5671349182.

The spelling of 3621553 in words is "three million, six hundred twenty-one thousand, five hundred fifty-three".