808861247 has 4 divisors (see below), whose sum is σ = 814218096. Its totient is φ = 803504400.

The previous prime is 808861237. The next prime is 808861297. The reversal of 808861247 is 742168808.

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

It is a cyclic number.

It is not a de Polignac number, because 808861247 - 2²⁴ = 792084031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 808861198 and 808861207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (808861237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2678198 + ... + 2678499.

It is an arithmetic number, because the mean of its divisors is an integer number (203554524).

Almost surely, 2^808861247 is an apocalyptic number.

808861247 is a deficient number, since it is larger than the sum of its proper divisors (5356849).

808861247 is a wasteful number, since it uses less digits than its factorization.

808861247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5356848.

The product of its (nonzero) digits is 172032, while the sum is 44.

The square root of 808861247 is about 28440.4860542150. The cubic root of 808861247 is about 931.7327110708.

The spelling of 808861247 in words is "eight hundred eight million, eight hundred sixty-one thousand, two hundred forty-seven".