891711913 has 2 divisors, whose sum is σ = 891711914. Its totient is φ = 891711912.

The previous prime is 891711907. The next prime is 891711937. The reversal of 891711913 is 319117198.

891711913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 873970969 + 17740944 = 29563^2 + 4212^2 .

It is a cyclic number.

It is not a de Polignac number, because 891711913 - 2⁵ = 891711881 is a prime.

It is a super-2 number, since 2×891711913² = 1590300271572239138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (891711983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445855956 + 445855957.

It is an arithmetic number, because the mean of its divisors is an integer number (445855957).

Almost surely, 2^891711913 is an apocalyptic number.

It is an amenable number.

891711913 is a deficient number, since it is larger than the sum of its proper divisors (1).

891711913 is an equidigital number, since it uses as much as digits as its factorization.

891711913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 40.

The square root of 891711913 is about 29861.5457235556. The cubic root of 891711913 is about 962.5165142048.

The spelling of 891711913 in words is "eight hundred ninety-one million, seven hundred eleven thousand, nine hundred thirteen".