1303661 has 4 divisors (see below), whose sum is σ = 1309632. Its totient is φ = 1297692.

The previous prime is 1303633. The next prime is 1303667. The reversal of 1303661 is 1663031.

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.

It is a cyclic number.

It is not a de Polignac number, because 1303661 - 2⁶ = 1303597 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 (1303667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2645 + ... + 3098.

It is an arithmetic number, because the mean of its divisors is an integer number (327408).

2^1303661 is an apocalyptic number.

It is an amenable number.

1303661 is a deficient number, since it is larger than the sum of its proper divisors (5971).

1303661 is an equidigital number, since it uses as much as digits as its factorization.

1303661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5970.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 1303661 is about 1141.7797510904. The cubic root of 1303661 is about 109.2416432925.

Adding to 1303661 its reverse (1663031), we get a palindrome (2966692).

The spelling of 1303661 in words is "one million, three hundred three thousand, six hundred sixty-one".