1356491321 has 2 divisors, whose sum is σ = 1356491322. Its totient is φ = 1356491320.

The previous prime is 1356491303. The next prime is 1356491341. The reversal of 1356491321 is 1231946531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 874030096 + 482461225 = 29564^2 + 21965^2 .

It is a cyclic number.

It is not a de Polignac number, because 1356491321 - 2¹⁴ = 1356474937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1356491341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678245660 + 678245661.

It is an arithmetic number, because the mean of its divisors is an integer number (678245661).

Almost surely, 2^1356491321 is an apocalyptic number.

It is an amenable number.

1356491321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356491321 is an equidigital number, since it uses as much as digits as its factorization.

1356491321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 1356491321 is about 36830.5758982941. The cubic root of 1356491321 is about 1106.9780424424.

The spelling of 1356491321 in words is "one billion, three hundred fifty-six million, four hundred ninety-one thousand, three hundred twenty-one".