1006391 has 2 divisors, whose sum is σ = 1006392. Its totient is φ = 1006390.

The previous prime is 1006367. The next prime is 1006393. The reversal of 1006391 is 1936001.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1006391 is a prime.

Together with 1006393, 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 (1006393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 503195 + 503196.

It is an arithmetic number, because the mean of its divisors is an integer number (503196).

2^1006391 is an apocalyptic number.

1006391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1006391 is an equidigital number, since it uses as much as digits as its factorization.

1006391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 1006391 is about 1003.1904106400. The cubic root of 1006391 is about 100.2125811058.

The spelling of 1006391 in words is "one million, six thousand, three hundred ninety-one".