2501000561 has 2 divisors, whose sum is σ = 2501000562. Its totient is φ = 2501000560.

The previous prime is 2501000539. The next prime is 2501000569. The reversal of 2501000561 is 1650001052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2230200625 + 270799936 = 47225^2 + 16456^2 .

It is a cyclic number.

It is not a de Polignac number, because 2501000561 - 2¹⁴ = 2500984177 is a prime.

It is a super-2 number, since 2×2501000561² = 12510007612244629442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2501000569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250500280 + 1250500281.

It is an arithmetic number, because the mean of its divisors is an integer number (1250500281).

Almost surely, 2^2501000561 is an apocalyptic number.

It is an amenable number.

2501000561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2501000561 is an equidigital number, since it uses as much as digits as its factorization.

2501000561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2501000561 is about 50010.0046090780. The cubic root of 2501000561 is about 1357.3898468412.

The spelling of 2501000561 in words is "two billion, five hundred one million, five hundred sixty-one", and thus it is an aban number.