1645349 has 2 divisors, whose sum is σ = 1645350. Its totient is φ = 1645348.

The previous prime is 1645337. The next prime is 1645363. The reversal of 1645349 is 9435461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1276900 + 368449 = 1130^2 + 607^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645349 - 2⁸ = 1645093 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822674 + 822675.

It is an arithmetic number, because the mean of its divisors is an integer number (822675).

2^1645349 is an apocalyptic number.

It is an amenable number.

1645349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645349 is an equidigital number, since it uses as much as digits as its factorization.

1645349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 1645349 is about 1282.7115809877. The cubic root of 1645349 is about 118.0554417244.

The spelling of 1645349 in words is "one million, six hundred forty-five thousand, three hundred forty-nine".