1321649 has 8 divisors (see below), whose sum is σ = 1576320. Its totient is φ = 1083456.

The previous prime is 1321637. The next prime is 1321651. The reversal of 1321649 is 9461231.

1321649 = T₆₁₁ + T₆₁₂ + ... + T₆₁₇.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321649 - 2⁴ = 1321633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3944 + ... + 4265.

It is an arithmetic number, because the mean of its divisors is an integer number (197040).

2^1321649 is an apocalyptic number.

It is an amenable number.

1321649 is a deficient number, since it is larger than the sum of its proper divisors (254671).

1321649 is an equidigital number, since it uses as much as digits as its factorization.

1321649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8239.

The product of its digits is 1296, while the sum is 26.

The square root of 1321649 is about 1149.6299404591. The cubic root of 1321649 is about 109.7417910607.

The spelling of 1321649 in words is "one million, three hundred twenty-one thousand, six hundred forty-nine".