1956391 has 2 divisors, whose sum is σ = 1956392. Its totient is φ = 1956390.

The previous prime is 1956359. The next prime is 1956419. The reversal of 1956391 is 1936591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1956391 - 2⁵ = 1956359 is a prime.

1956391 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1956341) 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, 978195 + 978196.

It is an arithmetic number, because the mean of its divisors is an integer number (978196).

2^1956391 is an apocalyptic number.

1956391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1956391 is an equidigital number, since it uses as much as digits as its factorization.

1956391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290, while the sum is 34.

The square root of 1956391 is about 1398.7104775471. The cubic root of 1956391 is about 125.0696358662.

The spelling of 1956391 in words is "one million, nine hundred fifty-six thousand, three hundred ninety-one".