809748793481 has 4 divisors (see below), whose sum is σ = 837671165700. Its totient is φ = 781826421264.

The previous prime is 809748793459. The next prime is 809748793501. The reversal of 809748793481 is 184397847908.

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 297178709881 + 512570083600 = 545141^2 + 715940^2 .

It is a cyclic number.

It is not a de Polignac number, because 809748793481 - 2¹⁸ = 809748531337 is a prime.

It is a super-2 number, since 2×809748793481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809748793181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13961186066 + ... + 13961186123.

It is an arithmetic number, because the mean of its divisors is an integer number (209417791425).

Almost surely, 2^809748793481 is an apocalyptic number.

It is an amenable number.

809748793481 is a deficient number, since it is larger than the sum of its proper divisors (27922372219).

809748793481 is a wasteful number, since it uses less digits than its factorization.

809748793481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27922372218.

The product of its (nonzero) digits is 97542144, while the sum is 68.

The spelling of 809748793481 in words is "eight hundred nine billion, seven hundred forty-eight million, seven hundred ninety-three thousand, four hundred eighty-one".