4491623 has 2 divisors, whose sum is σ = 4491624. Its totient is φ = 4491622.

The previous prime is 4491569. The next prime is 4491631. The reversal of 4491623 is 3261944.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4491623 - 2¹⁰ = 4490599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4491653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2245811 + 2245812.

It is an arithmetic number, because the mean of its divisors is an integer number (2245812).

Almost surely, 2^4491623 is an apocalyptic number.

4491623 is a deficient number, since it is larger than the sum of its proper divisors (1).

4491623 is an equidigital number, since it uses as much as digits as its factorization.

4491623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 4491623 is about 2119.3449459680. The cubic root of 4491623 is about 164.9938534594.

The spelling of 4491623 in words is "four million, four hundred ninety-one thousand, six hundred twenty-three".