809749340693 has 4 divisors (see below), whose sum is σ = 810586724640. Its totient is φ = 808911956748.

The previous prime is 809749340683. The next prime is 809749340713. The reversal of 809749340693 is 396043947908.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 809749340693 - 2¹⁴ = 809749324309 is a prime.

It is a super-3 number, since 3×809749340693³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809749340683) 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, 418690523 + ... + 418692456.

It is an arithmetic number, because the mean of its divisors is an integer number (202646681160).

Almost surely, 2^809749340693 is an apocalyptic number.

It is an amenable number.

809749340693 is a deficient number, since it is larger than the sum of its proper divisors (837383947).

809749340693 is an equidigital number, since it uses as much as digits as its factorization.

809749340693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837383946.

The product of its (nonzero) digits is 35271936, while the sum is 62.

The spelling of 809749340693 in words is "eight hundred nine billion, seven hundred forty-nine million, three hundred forty thousand, six hundred ninety-three".