1308649 has 2 divisors, whose sum is σ = 1308650. Its totient is φ = 1308648.

The previous prime is 1308647. The next prime is 1308691. The reversal of 1308649 is 9468031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1281424 + 27225 = 1132^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1308649 - 2¹ = 1308647 is a prime.

Together with 1308647, it forms a pair of twin primes.

It is a Chen prime.

1308649 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1308649.

It is not a weakly prime, because it can be changed into another prime (1308647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654324 + 654325.

It is an arithmetic number, because the mean of its divisors is an integer number (654325).

2^1308649 is an apocalyptic number.

It is an amenable number.

1308649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1308649 is an equidigital number, since it uses as much as digits as its factorization.

1308649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1308649 is about 1143.9619748925. The cubic root of 1308649 is about 109.3807908771.

The spelling of 1308649 in words is "one million, three hundred eight thousand, six hundred forty-nine".