2500510861 has 2 divisors, whose sum is σ = 2500510862. Its totient is φ = 2500510860.

The previous prime is 2500510847. The next prime is 2500510889. The reversal of 2500510861 is 1680150052.

It is the 20415-th star number.

It is an a-pointer prime, because the next prime (2500510889) can be obtained adding 2500510861 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1635798025 + 864712836 = 40445^2 + 29406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2500510861 is a prime.

It is a super-2 number, since 2×2500510861² = 12505109131957922642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2500510811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250255430 + 1250255431.

It is an arithmetic number, because the mean of its divisors is an integer number (1250255431).

Almost surely, 2^2500510861 is an apocalyptic number.

It is an amenable number.

2500510861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2500510861 is an equidigital number, since it uses as much as digits as its factorization.

2500510861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 2500510861 is about 50005.1083490477. The cubic root of 2500510861 is about 1357.3012480078.

The spelling of 2500510861 in words is "two billion, five hundred million, five hundred ten thousand, eight hundred sixty-one".