1345649 has 2 divisors, whose sum is σ = 1345650. Its totient is φ = 1345648.

The previous prime is 1345633. The next prime is 1345651. The reversal of 1345649 is 9465431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1345600 + 49 = 1160^2 + 7^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345649 - 2⁴ = 1345633 is a prime.

Together with 1345651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1345699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672824 + 672825.

It is an arithmetic number, because the mean of its divisors is an integer number (672825).

2^1345649 is an apocalyptic number.

It is an amenable number.

1345649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345649 is an equidigital number, since it uses as much as digits as its factorization.

1345649 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 1345649 is about 1160.0211204974. The cubic root of 1345649 is about 110.4020822001.

It can be divided in two parts, 13456 and 49, that multiplied together give a square (659344 = 812²).

The spelling of 1345649 in words is "one million, three hundred forty-five thousand, six hundred forty-nine".