1310891 has 2 divisors, whose sum is σ = 1310892. Its totient is φ = 1310890.

The previous prime is 1310851. The next prime is 1310899. The reversal of 1310891 is 1980131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1310891 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1310899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655445 + 655446.

It is an arithmetic number, because the mean of its divisors is an integer number (655446).

2^1310891 is an apocalyptic number.

1310891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1310891 is an equidigital number, since it uses as much as digits as its factorization.

1310891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1310891 is about 1144.9414832209. The cubic root of 1310891 is about 109.4432195908.

The spelling of 1310891 in words is "one million, three hundred ten thousand, eight hundred ninety-one".