2500891 has 2 divisors, whose sum is σ = 2500892. Its totient is φ = 2500890.

The previous prime is 2500889. The next prime is 2500919. The reversal of 2500891 is 1980052.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2500891 - 2¹ = 2500889 is a prime.

Together with 2500889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2500831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250445 + 1250446.

It is an arithmetic number, because the mean of its divisors is an integer number (1250446).

2^2500891 is an apocalyptic number.

2500891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2500891 is an equidigital number, since it uses as much as digits as its factorization.

2500891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 2500891 is about 1581.4205639235. The cubic root of 2500891 is about 135.7370025553.

The spelling of 2500891 in words is "two million, five hundred thousand, eight hundred ninety-one".