800720969 has 4 divisors (see below), whose sum is σ = 800872644. Its totient is φ = 800569296.

The previous prime is 800720957. The next prime is 800720989. The reversal of 800720969 is 969027008.

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 706921744 + 93799225 = 26588^2 + 9685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-800720969 is a prime.

It is a super-2 number, since 2×800720969² = 1282308140392597922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (800720929) 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, 67622 + ... + 78575.

It is an arithmetic number, because the mean of its divisors is an integer number (200218161).

Almost surely, 2^800720969 is an apocalyptic number.

It is an amenable number.

800720969 is a deficient number, since it is larger than the sum of its proper divisors (151675).

800720969 is a wasteful number, since it uses less digits than its factorization.

800720969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151674.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 800720969 is about 28297.0134289822. The cubic root of 800720969 is about 928.5965531292.

The spelling of 800720969 in words is "eight hundred million, seven hundred twenty thousand, nine hundred sixty-nine".