2556503 has 2 divisors, whose sum is σ = 2556504. Its totient is φ = 2556502.

The previous prime is 2556493. The next prime is 2556509. The reversal of 2556503 is 3056552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2556503 - 2⁴ = 2556487 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2556509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278251 + 1278252.

It is an arithmetic number, because the mean of its divisors is an integer number (1278252).

2^2556503 is an apocalyptic number.

2556503 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556503 is an equidigital number, since it uses as much as digits as its factorization.

2556503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 2556503 is about 1598.9068140451. The cubic root of 2556503 is about 136.7357579135.

The spelling of 2556503 in words is "two million, five hundred fifty-six thousand, five hundred three".