847491089 has 4 divisors (see below), whose sum is σ = 897343524. Its totient is φ = 797638656.

The previous prime is 847491083. The next prime is 847491109. The reversal of 847491089 is 980194748.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 597313600 + 250177489 = 24440^2 + 15817^2 .

It is a cyclic number.

It is not a de Polignac number, because 847491089 - 2¹² = 847486993 is a prime.

It is a super-2 number, since 2×847491089² = 1436482291868811842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (847491083) 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 in 3 ways as a sum of consecutive naturals, for example, 24926192 + ... + 24926225.

It is an arithmetic number, because the mean of its divisors is an integer number (224335881).

Almost surely, 2^847491089 is an apocalyptic number.

It is an amenable number.

847491089 is a deficient number, since it is larger than the sum of its proper divisors (49852435).

847491089 is a wasteful number, since it uses less digits than its factorization.

847491089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49852434.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 847491089 is about 29111.7002079920. The cubic root of 847491089 is about 946.3353141040.

The spelling of 847491089 in words is "eight hundred forty-seven million, four hundred ninety-one thousand, eighty-nine".