1356491 has 2 divisors, whose sum is σ = 1356492. Its totient is φ = 1356490.

The previous prime is 1356473. The next prime is 1356497. The reversal of 1356491 is 1946531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1356491 - 2⁶ = 1356427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1356497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678245 + 678246.

It is an arithmetic number, because the mean of its divisors is an integer number (678246).

2^1356491 is an apocalyptic number.

1356491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356491 is an equidigital number, since it uses as much as digits as its factorization.

1356491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 1356491 is about 1164.6849359376. The cubic root of 1356491 is about 110.6977955124.

The spelling of 1356491 in words is "one million, three hundred fifty-six thousand, four hundred ninety-one".