805742169 has 4 divisors (see below), whose sum is σ = 1074322896. Its totient is φ = 537161444.

The previous prime is 805742153. The next prime is 805742227. The reversal of 805742169 is 961247508.

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 805742169 - 2⁴ = 805742153 is a prime.

It is a super-2 number, since 2×805742169² = 1298440885809649122, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 805742169.

It is not an unprimeable number, because it can be changed into a prime (805742269) 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, 134290359 + ... + 134290364.

It is an arithmetic number, because the mean of its divisors is an integer number (268580724).

Almost surely, 2^805742169 is an apocalyptic number.

It is an amenable number.

805742169 is a deficient number, since it is larger than the sum of its proper divisors (268580727).

805742169 is a wasteful number, since it uses less digits than its factorization.

805742169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268580726.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 805742169 is about 28385.5979151400. The cubic root of 805742169 is about 930.5335393821.

The spelling of 805742169 in words is "eight hundred five million, seven hundred forty-two thousand, one hundred sixty-nine".