4945621 has 6 divisors (see below), whose sum is σ = 5170550. Its totient is φ = 4730088.

The previous prime is 4945613. The next prime is 4945639. The reversal of 4945621 is 1265494.

It can be written as a sum of positive squares in only one way, i.e., 4774225 + 171396 = 2185^2 + 414^2 .

It is not a de Polignac number, because 4945621 - 2³ = 4945613 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 (4945601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4146 + ... + 5203.

Almost surely, 2^4945621 is an apocalyptic number.

It is an amenable number.

4945621 is a deficient number, since it is larger than the sum of its proper divisors (224929).

4945621 is an equidigital number, since it uses as much as digits as its factorization.

4945621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9395 (or 9372 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 4945621 is about 2223.8752213198. The cubic root of 4945621 is about 170.3754217638.

The spelling of 4945621 in words is "four million, nine hundred forty-five thousand, six hundred twenty-one".