1025891 has 2 divisors, whose sum is σ = 1025892. Its totient is φ = 1025890.

The previous prime is 1025887. The next prime is 1025897. The reversal of 1025891 is 1985201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1025891 - 2² = 1025887 is a prime.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1025891.

It is not a weakly prime, because it can be changed into another prime (1025897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512945 + 512946.

It is an arithmetic number, because the mean of its divisors is an integer number (512946).

2^1025891 is an apocalyptic number.

1025891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025891 is an equidigital number, since it uses as much as digits as its factorization.

1025891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1025891 is about 1012.8627745159. The cubic root of 1025891 is about 100.8556903882.

The spelling of 1025891 in words is "one million, twenty-five thousand, eight hundred ninety-one".