891816713 has 2 divisors, whose sum is σ = 891816714. Its totient is φ = 891816712.

The previous prime is 891816659. The next prime is 891816749. The reversal of 891816713 is 317618198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 889649929 + 2166784 = 29827^2 + 1472^2 .

It is a cyclic number.

It is not a de Polignac number, because 891816713 - 2¹² = 891812617 is a prime.

It is a super-2 number, since 2×891816713² = 1590674099172248738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (891816313) 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 as a sum of consecutive naturals, namely, 445908356 + 445908357.

It is an arithmetic number, because the mean of its divisors is an integer number (445908357).

Almost surely, 2^891816713 is an apocalyptic number.

It is an amenable number.

891816713 is a deficient number, since it is larger than the sum of its proper divisors (1).

891816713 is an equidigital number, since it uses as much as digits as its factorization.

891816713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 891816713 is about 29863.3004371586. The cubic root of 891816713 is about 962.5542198725.

The spelling of 891816713 in words is "eight hundred ninety-one million, eight hundred sixteen thousand, seven hundred thirteen".