891708481 has 2 divisors, whose sum is σ = 891708482. Its totient is φ = 891708480.

The previous prime is 891708479. The next prime is 891708511. The reversal of 891708481 is 184807198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 784896256 + 106812225 = 28016^2 + 10335^2 .

It is a cyclic number.

It is not a de Polignac number, because 891708481 - 2¹ = 891708479 is a prime.

It is a super-2 number, since 2×891708481² = 1590288030174654722, which contains 22 as substring.

Together with 891708479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (891708401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445854240 + 445854241.

It is an arithmetic number, because the mean of its divisors is an integer number (445854241).

Almost surely, 2^891708481 is an apocalyptic number.

It is an amenable number.

891708481 is a deficient number, since it is larger than the sum of its proper divisors (1).

891708481 is an equidigital number, since it uses as much as digits as its factorization.

891708481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 891708481 is about 29861.4882582901. The cubic root of 891708481 is about 962.5152793661.

The spelling of 891708481 in words is "eight hundred ninety-one million, seven hundred eight thousand, four hundred eighty-one".