1556623 has 2 divisors, whose sum is σ = 1556624. Its totient is φ = 1556622.

The previous prime is 1556609. The next prime is 1556641. The reversal of 1556623 is 3266551.

It is a weak prime.

It is an emirp because it is prime and its reverse (3266551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1556623 - 2⁵ = 1556591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1556591 and 1556600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1556323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778311 + 778312.

It is an arithmetic number, because the mean of its divisors is an integer number (778312).

2^1556623 is an apocalyptic number.

1556623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556623 is an equidigital number, since it uses as much as digits as its factorization.

1556623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 28.

The square root of 1556623 is about 1247.6469853288. The cubic root of 1556623 is about 115.8940520933.

The spelling of 1556623 in words is "one million, five hundred fifty-six thousand, six hundred twenty-three".