4535621 has 4 divisors (see below), whose sum is σ = 4552044. Its totient is φ = 4519200.

The previous prime is 4535611. The next prime is 4535639. The reversal of 4535621 is 1265354.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1265354 = 2 ⋅632677.

It can be written as a sum of positive squares in 2 ways, for example, as 2464900 + 2070721 = 1570^2 + 1439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4535621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4535611) 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, 7790 + ... + 8351.

It is an arithmetic number, because the mean of its divisors is an integer number (1138011).

Almost surely, 2^4535621 is an apocalyptic number.

It is an amenable number.

4535621 is a deficient number, since it is larger than the sum of its proper divisors (16423).

4535621 is a wasteful number, since it uses less digits than its factorization.

4535621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16422.

The product of its digits is 3600, while the sum is 26.

The square root of 4535621 is about 2129.6997440954. The cubic root of 4535621 is about 165.5308400829.

It can be divided in two parts, 45 and 35621, that multiplied together give a triangular number (1602945 = T₁₇₉₀).

The spelling of 4535621 in words is "four million, five hundred thirty-five thousand, six hundred twenty-one".