1316661 has 4 divisors (see below), whose sum is σ = 1755552. Its totient is φ = 877772.

The previous prime is 1316657. The next prime is 1316669. The reversal of 1316661 is 1666131.

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 1316661 - 2² = 1316657 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316669) 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, 219441 + ... + 219446.

It is an arithmetic number, because the mean of its divisors is an integer number (438888).

2^1316661 is an apocalyptic number.

It is an amenable number.

1316661 is a deficient number, since it is larger than the sum of its proper divisors (438891).

1316661 is an equidigital number, since it uses as much as digits as its factorization.

1316661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438890.

The product of its digits is 648, while the sum is 24.

The square root of 1316661 is about 1147.4584959814. The cubic root of 1316661 is about 109.6035591666.

The spelling of 1316661 in words is "one million, three hundred sixteen thousand, six hundred sixty-one".