1396561 has 2 divisors, whose sum is σ = 1396562. Its totient is φ = 1396560.

The previous prime is 1396559. The next prime is 1396579. The reversal of 1396561 is 1656931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1252161 + 144400 = 1119^2 + 380^2 .

It is an emirp because it is prime and its reverse (1656931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1396561 - 2¹ = 1396559 is a prime.

Together with 1396559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1396531) 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, 698280 + 698281.

It is an arithmetic number, because the mean of its divisors is an integer number (698281).

2^1396561 is an apocalyptic number.

1396561 is the 529-th centered decagonal number.

It is an amenable number.

1396561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1396561 is an equidigital number, since it uses as much as digits as its factorization.

1396561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 31.

The square root of 1396561 is about 1181.7618203344. The cubic root of 1396561 is about 111.7772197872. Note that the first 3 decimals are identical.

The spelling of 1396561 in words is "one million, three hundred ninety-six thousand, five hundred sixty-one".