2551603 has 2 divisors, whose sum is σ = 2551604. Its totient is φ = 2551602.

The previous prime is 2551559. The next prime is 2551607. The reversal of 2551603 is 3061552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2551603 - 2¹⁷ = 2420531 is a prime.

It is not a weakly prime, because it can be changed into another prime (2551607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275801 + 1275802.

It is an arithmetic number, because the mean of its divisors is an integer number (1275802).

2^2551603 is an apocalyptic number.

2551603 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551603 is an equidigital number, since it uses as much as digits as its factorization.

2551603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 2551603 is about 1597.3737821812. The cubic root of 2551603 is about 136.6483424437.

The spelling of 2551603 in words is "two million, five hundred fifty-one thousand, six hundred three".