850721969 has 8 divisors (see below), whose sum is σ = 859401312. Its totient is φ = 842063040.

The previous prime is 850721957. The next prime is 850721983. The reversal of 850721969 is 969127058.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 850721969 - 2²⁰ = 849673393 is a prime.

It is a super-2 number, since 2×850721969² = 1447455737078473922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (850721869) 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 7 ways as a sum of consecutive naturals, for example, 87002 + ... + 96284.

It is an arithmetic number, because the mean of its divisors is an integer number (107425164).

Almost surely, 2^850721969 is an apocalyptic number.

It is an amenable number.

850721969 is a deficient number, since it is larger than the sum of its proper divisors (8679343).

850721969 is a wasteful number, since it uses less digits than its factorization.

850721969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10207.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 850721969 is about 29167.1385123738. The cubic root of 850721969 is about 947.5363567014.

The spelling of 850721969 in words is "eight hundred fifty million, seven hundred twenty-one thousand, nine hundred sixty-nine".