891748439 has 2 divisors, whose sum is σ = 891748440. Its totient is φ = 891748438.

The previous prime is 891748421. The next prime is 891748453. The reversal of 891748439 is 934847198.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891748439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891748339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445874219 + 445874220.

It is an arithmetic number, because the mean of its divisors is an integer number (445874220).

Almost surely, 2^891748439 is an apocalyptic number.

891748439 is a deficient number, since it is larger than the sum of its proper divisors (1).

891748439 is an equidigital number, since it uses as much as digits as its factorization.

891748439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The square root of 891748439 is about 29862.1573065310. The cubic root of 891748439 is about 962.5296561167.

The spelling of 891748439 in words is "eight hundred ninety-one million, seven hundred forty-eight thousand, four hundred thirty-nine".