2603021561 has 12 divisors (see below), whose sum is σ = 3029076900. Its totient is φ = 2230371360.

The previous prime is 2603021549. The next prime is 2603021579. The reversal of 2603021561 is 1651203062.

It can be written as a sum of positive squares in 2 ways, for example, as 682829161 + 1920192400 = 26131^2 + 43820^2 .

It is not a de Polignac number, because 2603021561 - 2⁶ = 2603021497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2603021561.

It is not an unprimeable number, because it can be changed into a prime (2603024561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161915 + ... + 177263.

It is an arithmetic number, because the mean of its divisors is an integer number (252423075).

Almost surely, 2^2603021561 is an apocalyptic number.

It is an amenable number.

2603021561 is a deficient number, since it is larger than the sum of its proper divisors (426055339).

2603021561 is a wasteful number, since it uses less digits than its factorization.

2603021561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18824 (or 18817 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2603021561 is about 51019.8153759890. The cubic root of 2603021561 is about 1375.6013345092.

The spelling of 2603021561 in words is "two billion, six hundred three million, twenty-one thousand, five hundred sixty-one".