1286191 has 2 divisors, whose sum is σ = 1286192. Its totient is φ = 1286190.

The previous prime is 1286189. The next prime is 1286209. The reversal of 1286191 is 1916821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1286191 - 2¹ = 1286189 is a prime.

Together with 1286189, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1286491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643095 + 643096.

It is an arithmetic number, because the mean of its divisors is an integer number (643096).

2^1286191 is an apocalyptic number.

1286191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286191 is an equidigital number, since it uses as much as digits as its factorization.

1286191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 28.

The square root of 1286191 is about 1134.1036107870. The cubic root of 1286191 is about 108.7514748556.

The spelling of 1286191 in words is "one million, two hundred eighty-six thousand, one hundred ninety-one".