2505210091 has 2 divisors, whose sum is σ = 2505210092. Its totient is φ = 2505210090.

The previous prime is 2505210089. The next prime is 2505210137. The reversal of 2505210091 is 1900125052.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2505210091 - 2¹ = 2505210089 is a prime.

Together with 2505210089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2505210011) 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, 1252605045 + 1252605046.

It is an arithmetic number, because the mean of its divisors is an integer number (1252605046).

Almost surely, 2^2505210091 is an apocalyptic number.

2505210091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2505210091 is an equidigital number, since it uses as much as digits as its factorization.

2505210091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 2505210091 is about 50052.0737932006. The cubic root of 2505210091 is about 1358.1509782810.

The spelling of 2505210091 in words is "two billion, five hundred five million, two hundred ten thousand, ninety-one".