4993621 has 2 divisors, whose sum is σ = 4993622. Its totient is φ = 4993620.

The previous prime is 4993619. The next prime is 4993627. The reversal of 4993621 is 1263994.

4993621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3290596 + 1703025 = 1814^2 + 1305^2 .

It is a cyclic number.

It is not a de Polignac number, because 4993621 - 2¹ = 4993619 is a prime.

Together with 4993619, it forms a pair of twin primes.

4993621 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4993627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2496810 + 2496811.

It is an arithmetic number, because the mean of its divisors is an integer number (2496811).

Almost surely, 2^4993621 is an apocalyptic number.

It is an amenable number.

4993621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4993621 is an equidigital number, since it uses as much as digits as its factorization.

4993621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 4993621 is about 2234.6411345001. The cubic root of 4993621 is about 170.9248441434.

The spelling of 4993621 in words is "four million, nine hundred ninety-three thousand, six hundred twenty-one".