4561621 has 2 divisors, whose sum is σ = 4561622. Its totient is φ = 4561620.

The previous prime is 4561607. The next prime is 4561631. The reversal of 4561621 is 1261654.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2640625 + 1920996 = 1625^2 + 1386^2 .

It is a cyclic number.

It is not a de Polignac number, because 4561621 - 2⁵ = 4561589 is a prime.

It is a super-2 number, since 2×4561621² = 41616772295282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4561631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2280810 + 2280811.

It is an arithmetic number, because the mean of its divisors is an integer number (2280811).

Almost surely, 2^4561621 is an apocalyptic number.

It is an amenable number.

4561621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4561621 is an equidigital number, since it uses as much as digits as its factorization.

4561621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 4561621 is about 2135.7951680814. The cubic root of 4561621 is about 165.8465340254.

The spelling of 4561621 in words is "four million, five hundred sixty-one thousand, six hundred twenty-one".