2501561791 has 2 divisors, whose sum is σ = 2501561792. Its totient is φ = 2501561790.

The previous prime is 2501561767. The next prime is 2501561801. The reversal of 2501561791 is 1971651052.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2501561791 - 2¹¹ = 2501559743 is a prime.

It is a super-2 number, since 2×2501561791² = 12515622788382255362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2501561791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2501561731) 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 as a sum of consecutive naturals, namely, 1250780895 + 1250780896.

It is an arithmetic number, because the mean of its divisors is an integer number (1250780896).

Almost surely, 2^2501561791 is an apocalyptic number.

2501561791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2501561791 is an equidigital number, since it uses as much as digits as its factorization.

2501561791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 37.

The square root of 2501561791 is about 50015.6154715705. The cubic root of 2501561791 is about 1357.4913729983.

The spelling of 2501561791 in words is "two billion, five hundred one million, five hundred sixty-one thousand, seven hundred ninety-one".