2501561813 has 2 divisors, whose sum is σ = 2501561814. Its totient is φ = 2501561812.

The previous prime is 2501561801. The next prime is 2501561891. The reversal of 2501561813 is 3181651052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2035994884 + 465566929 = 45122^2 + 21577^2 .

It is a cyclic number.

It is not a de Polignac number, because 2501561813 - 2²⁴ = 2484784597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2501561813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2501561113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250780906 + 1250780907.

It is an arithmetic number, because the mean of its divisors is an integer number (1250780907).

Almost surely, 2^2501561813 is an apocalyptic number.

It is an amenable number.

2501561813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2501561813 is an equidigital number, since it uses as much as digits as its factorization.

2501561813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 2501561813 is about 50015.6156915018. The cubic root of 2501561813 is about 1357.4913769778.

The spelling of 2501561813 in words is "two billion, five hundred one million, five hundred sixty-one thousand, eight hundred thirteen".