4375621 has 2 divisors, whose sum is σ = 4375622. Its totient is φ = 4375620.

The previous prime is 4375603. The next prime is 4375633. The reversal of 4375621 is 1265734.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2656900 + 1718721 = 1630^2 + 1311^2 .

It is a cyclic number.

It is not a de Polignac number, because 4375621 - 2⁷ = 4375493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4375621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4375691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2187810 + 2187811.

It is an arithmetic number, because the mean of its divisors is an integer number (2187811).

Almost surely, 2^4375621 is an apocalyptic number.

It is an amenable number.

4375621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4375621 is an equidigital number, since it uses as much as digits as its factorization.

4375621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 28.

The square root of 4375621 is about 2091.7985084611. The cubic root of 4375621 is about 163.5610535516.

The spelling of 4375621 in words is "four million, three hundred seventy-five thousand, six hundred twenty-one".