2501561801 has 2 divisors, whose sum is σ = 2501561802. Its totient is φ = 2501561800.

The previous prime is 2501561791. The next prime is 2501561813. The reversal of 2501561801 is 1081651052.

2501561801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2064793600 + 436768201 = 45440^2 + 20899^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2501561801 is a prime.

It is a super-2 number, since 2×2501561801² = 12515622888444727202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2501561891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250780900 + 1250780901.

It is an arithmetic number, because the mean of its divisors is an integer number (1250780901).

Almost surely, 2^2501561801 is an apocalyptic number.

It is an amenable number.

2501561801 is a deficient number, since it is larger than the sum of its proper divisors (1).

2501561801 is an equidigital number, since it uses as much as digits as its factorization.

2501561801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 29.

The square root of 2501561801 is about 50015.6155715393. The cubic root of 2501561801 is about 1357.4913748071.

The spelling of 2501561801 in words is "two billion, five hundred one million, five hundred sixty-one thousand, eight hundred one".