4309621 has 2 divisors, whose sum is σ = 4309622. Its totient is φ = 4309620.

The previous prime is 4309583. The next prime is 4309673. The reversal of 4309621 is 1269034.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4157521 + 152100 = 2039^2 + 390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4309621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4309121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2154810 + 2154811.

It is an arithmetic number, because the mean of its divisors is an integer number (2154811).

Almost surely, 2^4309621 is an apocalyptic number.

It is an amenable number.

4309621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4309621 is an equidigital number, since it uses as much as digits as its factorization.

4309621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 4309621 is about 2075.9626682578. The cubic root of 4309621 is about 162.7345221213.

The spelling of 4309621 in words is "four million, three hundred nine thousand, six hundred twenty-one".