1305641 has 4 divisors (see below), whose sum is σ = 1362432. Its totient is φ = 1248852.

The previous prime is 1305637. The next prime is 1305643. The reversal of 1305641 is 1465031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1465031 = 23 ⋅63697.

It is a cyclic number.

It is not a de Polignac number, because 1305641 - 2² = 1305637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305643) 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 in 3 ways as a sum of consecutive naturals, for example, 28361 + ... + 28406.

It is an arithmetic number, because the mean of its divisors is an integer number (340608).

2^1305641 is an apocalyptic number.

It is an amenable number.

1305641 is a deficient number, since it is larger than the sum of its proper divisors (56791).

1305641 is an equidigital number, since it uses as much as digits as its factorization.

1305641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56790.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1305641 is about 1142.6464895146. The cubic root of 1305641 is about 109.2969207103.

The spelling of 1305641 in words is "one million, three hundred five thousand, six hundred forty-one".