4509621 has 8 divisors (see below), whose sum is σ = 6680960. Its totient is φ = 3006396.

The previous prime is 4509619. The next prime is 4509623. The reversal of 4509621 is 1269054.

It is an interprime number because it is at equal distance from previous prime (4509619) and next prime (4509623).

It is not a de Polignac number, because 4509621 - 2¹ = 4509619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 167023 = 4509621 / (4 + 5 + 0 + 9 + 6 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4509623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83485 + ... + 83538.

It is an arithmetic number, because the mean of its divisors is an integer number (835120).

Almost surely, 2^4509621 is an apocalyptic number.

It is an amenable number.

4509621 is a deficient number, since it is larger than the sum of its proper divisors (2171339).

4509621 is a wasteful number, since it uses less digits than its factorization.

4509621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167032 (or 167026 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 4509621 is about 2123.5868242198. The cubic root of 4509621 is about 165.2139373671.

The spelling of 4509621 in words is "four million, five hundred nine thousand, six hundred twenty-one".