1316891 has 4 divisors (see below), whose sum is σ = 1341792. Its totient is φ = 1291992.

The previous prime is 1316881. The next prime is 1316899. The reversal of 1316891 is 1986131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1316891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1316899) 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, 12371 + ... + 12476.

It is an arithmetic number, because the mean of its divisors is an integer number (335448).

2^1316891 is an apocalyptic number.

1316891 is a deficient number, since it is larger than the sum of its proper divisors (24901).

1316891 is an equidigital number, since it uses as much as digits as its factorization.

1316891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24900.

The product of its digits is 1296, while the sum is 29.

The square root of 1316891 is about 1147.5587130949. The cubic root of 1316891 is about 109.6099408019.

The spelling of 1316891 in words is "one million, three hundred sixteen thousand, eight hundred ninety-one".