2521001603 has 2 divisors, whose sum is σ = 2521001604. Its totient is φ = 2521001602.

The previous prime is 2521001591. The next prime is 2521001611. The reversal of 2521001603 is 3061001252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2521001603 - 2⁸ = 2521001347 is a prime.

It is not a weakly prime, because it can be changed into another prime (2521001633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260500801 + 1260500802.

It is an arithmetic number, because the mean of its divisors is an integer number (1260500802).

Almost surely, 2^2521001603 is an apocalyptic number.

2521001603 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521001603 is an equidigital number, since it uses as much as digits as its factorization.

2521001603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2521001603 is about 50209.5768056254. The cubic root of 2521001603 is about 1360.9986902905.

Adding to 2521001603 its reverse (3061001252), we get a palindrome (5582002855).

The spelling of 2521001603 in words is "two billion, five hundred twenty-one million, one thousand, six hundred three".